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The generally agreed upon definition of hallucinations is that they are actually perceptions in the absence of an external stimulus of the relevant sensory organ. These perceptions are accompanied by a persuasive sense of their reality. Hallucinations are not to be confused with illusions, which are misinterpretations of actual external stimuli. In other words, in the case of a hallucination, for a person hallucinating a sound for instance, the sound actually exists, but in reality it exists nowhere but in the person’s mind; however, in the case of an illusion the stimulus that caused the illusion does exist in the real world. Although hallucinations are a key diagnostic feature of schizophrenia, a mental disorder that distorts the way a person thinks, acts, expresses emotions, perceives reality, and relates to others, they can occur in individuals devoid of any physical or mental disorder.
In order to understand why people hallucinate, some researchers have been studying people suffering from what is called the phantom limb syndrome, a condition in which people who have undergone amputation feel as though the missing body part were still very much present and attached to the body; for instance, it is not uncommon for a person who has lost a leg to unknowingly try to stand and walk without any external support after their surgery. One of the two main hypotheses behind the phantom limb syndrome offers an explanation that is possibly applicable to why people hallucinate in certain circumstances. As per this theory, the brain is programmed for a body where every body part is intact and in the appropriate place. Accordingly, when some signals go missing, because of the missing body part, the brain compensates for the lack of sensory input by triggering spontaneous nerve cell activity. Although this theory has limited applicability for understanding why patients such as those of schizophrenia hallucinate in conditions not deemed out of the ordinary, it is a step forward in understanding why people experience visual or auditory hallucinations when they are placed in solitary confinements; after all the different areas of the brain that were used to receiving signals through the senses start to stimulate themselves in to action. 
Which of the following is mentioned in the passage?
  • a)
    Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.
  • b)
    Hallucinations cannot be experienced at the same time as illusions. 
  • c)
    A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition. 
  • d)
    Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.
  • e)
    An illusion happens after there has been a real external trigger for the same.
Correct answer is option 'E'. Can you explain this answer?
Verified Answer
The generally agreed upon definition of hallucinations is that they ar...
Passage Analysis
Summary and Main Point
Pre-Thinking
This is a Detail question. Keep crossing out answer choices that are not explicitly stated in the passage and choose the one for which you can directly refer to a portion in the passage.
Answer Choices
A
Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.
Incorrect: Out of Scope
There is no mention of chemical imbalance anywhere in the passage. Also, the author mentions in the last sentence of the first paragraph that hallucinations can occur in people who DO NOT have any mental disorder.
B
Hallucinations cannot be experienced at the same time as illusions. 
Incorrect: Out of Scope
There is no information given regarding the possibility of experiencing the two phenomena at the same time. Hence, this choice has no relevant basis in the passage.
C
A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition. 
Incorrect: Out of Scope
The author does not discuss the probability of experiencing hallucinations and phantom limb syndrome.
D
Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.
Incorrect: Out of Scope
These types of hallucinations are mentioned in the second paragraph for people in solitary confinements; however, nowhere does the author say that these are "two most common" types of hallucinations in such circumstances.
E
An illusion happens after there has been a real external trigger for the same.
Correct
This is stated in the first paragraph of the passage. The author says that ...illusions, which are misinterpretations of actual external stimuli
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The generally agreed upon definition of hallucinations is that they are actually perceptions in the absence of an external stimulus of the relevant sensory organ. These perceptions are accompanied by a persuasive sense of their reality. Hallucinations are not to be confused with illusions, which are misinterpretations of actual external stimuli. In other words, in the case of a hallucination, for a person hallucinating a sound for instance, the sound actually exists, but in reality it exists nowhere but in the person’s mind; however, in the case of an illusion the stimulus that caused the illusion does exist in the real world. Although hallucinations are a key diagnostic feature of schizophrenia, a mental disorder that distorts the way a person thinks, acts, expresses emotions, perceives reality, and relates to others, they can occur in individuals devoid of any physical or mental disorder.In order to understand why people hallucinate, some researchers have been studying people suffering from what is called the phantom limb syndrome, a condition in which people who have undergone amputation feel as though the missing body part were still very much present and attached to the body; for instance, it is not uncommon for a person who has lost a leg to unknowingly try to stand and walk without any external support after their surgery. One of the two main hypotheses behind the phantom limb syndrome offers an explanation that is possibly applicable to why people hallucinate in certain circumstances. As per this theory, the brain is programmed for a body where every body part is intact and in the appropriate place. Accordingly, when some signals go missing, because of the missing body part, the brain compensates for the lack of sensory input by triggering spontaneous nerve cell activity. Although this theory has limited applicability for understanding why patients such as those of schizophrenia hallucinate in conditions not deemed out of the ordinary, it is a step forward in understanding why people experience visual or auditory hallucinations when they are placed in solitary confinements; after all the different areas of the brain that were used to receiving signals through the senses start to stimulate themselves in to action.Which of the following is mentioned in the passage?a)Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.b)Hallucinations cannot be experienced at the same time as illusions.c)A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition.d)Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.e)An illusion happens after there has been a real external trigger for the same.Correct answer is option 'E'. Can you explain this answer?
Question Description
The generally agreed upon definition of hallucinations is that they are actually perceptions in the absence of an external stimulus of the relevant sensory organ. These perceptions are accompanied by a persuasive sense of their reality. Hallucinations are not to be confused with illusions, which are misinterpretations of actual external stimuli. In other words, in the case of a hallucination, for a person hallucinating a sound for instance, the sound actually exists, but in reality it exists nowhere but in the person’s mind; however, in the case of an illusion the stimulus that caused the illusion does exist in the real world. Although hallucinations are a key diagnostic feature of schizophrenia, a mental disorder that distorts the way a person thinks, acts, expresses emotions, perceives reality, and relates to others, they can occur in individuals devoid of any physical or mental disorder.In order to understand why people hallucinate, some researchers have been studying people suffering from what is called the phantom limb syndrome, a condition in which people who have undergone amputation feel as though the missing body part were still very much present and attached to the body; for instance, it is not uncommon for a person who has lost a leg to unknowingly try to stand and walk without any external support after their surgery. One of the two main hypotheses behind the phantom limb syndrome offers an explanation that is possibly applicable to why people hallucinate in certain circumstances. As per this theory, the brain is programmed for a body where every body part is intact and in the appropriate place. Accordingly, when some signals go missing, because of the missing body part, the brain compensates for the lack of sensory input by triggering spontaneous nerve cell activity. Although this theory has limited applicability for understanding why patients such as those of schizophrenia hallucinate in conditions not deemed out of the ordinary, it is a step forward in understanding why people experience visual or auditory hallucinations when they are placed in solitary confinements; after all the different areas of the brain that were used to receiving signals through the senses start to stimulate themselves in to action.Which of the following is mentioned in the passage?a)Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.b)Hallucinations cannot be experienced at the same time as illusions.c)A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition.d)Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.e)An illusion happens after there has been a real external trigger for the same.Correct answer is option 'E'. Can you explain this answer? for GMAT 2024 is part of GMAT preparation. The Question and answers have been prepared according to the GMAT exam syllabus. Information about The generally agreed upon definition of hallucinations is that they are actually perceptions in the absence of an external stimulus of the relevant sensory organ. These perceptions are accompanied by a persuasive sense of their reality. Hallucinations are not to be confused with illusions, which are misinterpretations of actual external stimuli. In other words, in the case of a hallucination, for a person hallucinating a sound for instance, the sound actually exists, but in reality it exists nowhere but in the person’s mind; however, in the case of an illusion the stimulus that caused the illusion does exist in the real world. Although hallucinations are a key diagnostic feature of schizophrenia, a mental disorder that distorts the way a person thinks, acts, expresses emotions, perceives reality, and relates to others, they can occur in individuals devoid of any physical or mental disorder.In order to understand why people hallucinate, some researchers have been studying people suffering from what is called the phantom limb syndrome, a condition in which people who have undergone amputation feel as though the missing body part were still very much present and attached to the body; for instance, it is not uncommon for a person who has lost a leg to unknowingly try to stand and walk without any external support after their surgery. One of the two main hypotheses behind the phantom limb syndrome offers an explanation that is possibly applicable to why people hallucinate in certain circumstances. As per this theory, the brain is programmed for a body where every body part is intact and in the appropriate place. Accordingly, when some signals go missing, because of the missing body part, the brain compensates for the lack of sensory input by triggering spontaneous nerve cell activity. Although this theory has limited applicability for understanding why patients such as those of schizophrenia hallucinate in conditions not deemed out of the ordinary, it is a step forward in understanding why people experience visual or auditory hallucinations when they are placed in solitary confinements; after all the different areas of the brain that were used to receiving signals through the senses start to stimulate themselves in to action.Which of the following is mentioned in the passage?a)Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.b)Hallucinations cannot be experienced at the same time as illusions.c)A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition.d)Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.e)An illusion happens after there has been a real external trigger for the same.Correct answer is option 'E'. Can you explain this answer? covers all topics & solutions for GMAT 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The generally agreed upon definition of hallucinations is that they are actually perceptions in the absence of an external stimulus of the relevant sensory organ. These perceptions are accompanied by a persuasive sense of their reality. Hallucinations are not to be confused with illusions, which are misinterpretations of actual external stimuli. In other words, in the case of a hallucination, for a person hallucinating a sound for instance, the sound actually exists, but in reality it exists nowhere but in the person’s mind; however, in the case of an illusion the stimulus that caused the illusion does exist in the real world. Although hallucinations are a key diagnostic feature of schizophrenia, a mental disorder that distorts the way a person thinks, acts, expresses emotions, perceives reality, and relates to others, they can occur in individuals devoid of any physical or mental disorder.In order to understand why people hallucinate, some researchers have been studying people suffering from what is called the phantom limb syndrome, a condition in which people who have undergone amputation feel as though the missing body part were still very much present and attached to the body; for instance, it is not uncommon for a person who has lost a leg to unknowingly try to stand and walk without any external support after their surgery. One of the two main hypotheses behind the phantom limb syndrome offers an explanation that is possibly applicable to why people hallucinate in certain circumstances. As per this theory, the brain is programmed for a body where every body part is intact and in the appropriate place. Accordingly, when some signals go missing, because of the missing body part, the brain compensates for the lack of sensory input by triggering spontaneous nerve cell activity. Although this theory has limited applicability for understanding why patients such as those of schizophrenia hallucinate in conditions not deemed out of the ordinary, it is a step forward in understanding why people experience visual or auditory hallucinations when they are placed in solitary confinements; after all the different areas of the brain that were used to receiving signals through the senses start to stimulate themselves in to action.Which of the following is mentioned in the passage?a)Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.b)Hallucinations cannot be experienced at the same time as illusions.c)A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition.d)Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.e)An illusion happens after there has been a real external trigger for the same.Correct answer is option 'E'. Can you explain this answer?.
Solutions for The generally agreed upon definition of hallucinations is that they are actually perceptions in the absence of an external stimulus of the relevant sensory organ. These perceptions are accompanied by a persuasive sense of their reality. Hallucinations are not to be confused with illusions, which are misinterpretations of actual external stimuli. In other words, in the case of a hallucination, for a person hallucinating a sound for instance, the sound actually exists, but in reality it exists nowhere but in the person’s mind; however, in the case of an illusion the stimulus that caused the illusion does exist in the real world. Although hallucinations are a key diagnostic feature of schizophrenia, a mental disorder that distorts the way a person thinks, acts, expresses emotions, perceives reality, and relates to others, they can occur in individuals devoid of any physical or mental disorder.In order to understand why people hallucinate, some researchers have been studying people suffering from what is called the phantom limb syndrome, a condition in which people who have undergone amputation feel as though the missing body part were still very much present and attached to the body; for instance, it is not uncommon for a person who has lost a leg to unknowingly try to stand and walk without any external support after their surgery. One of the two main hypotheses behind the phantom limb syndrome offers an explanation that is possibly applicable to why people hallucinate in certain circumstances. As per this theory, the brain is programmed for a body where every body part is intact and in the appropriate place. Accordingly, when some signals go missing, because of the missing body part, the brain compensates for the lack of sensory input by triggering spontaneous nerve cell activity. Although this theory has limited applicability for understanding why patients such as those of schizophrenia hallucinate in conditions not deemed out of the ordinary, it is a step forward in understanding why people experience visual or auditory hallucinations when they are placed in solitary confinements; after all the different areas of the brain that were used to receiving signals through the senses start to stimulate themselves in to action.Which of the following is mentioned in the passage?a)Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.b)Hallucinations cannot be experienced at the same time as illusions.c)A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition.d)Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.e)An illusion happens after there has been a real external trigger for the same.Correct answer is option 'E'. Can you explain this answer? in English & in Hindi are available as part of our courses for GMAT. Download more important topics, notes, lectures and mock test series for GMAT Exam by signing up for free.
Here you can find the meaning of The generally agreed upon definition of hallucinations is that they are actually perceptions in the absence of an external stimulus of the relevant sensory organ. These perceptions are accompanied by a persuasive sense of their reality. Hallucinations are not to be confused with illusions, which are misinterpretations of actual external stimuli. In other words, in the case of a hallucination, for a person hallucinating a sound for instance, the sound actually exists, but in reality it exists nowhere but in the person’s mind; however, in the case of an illusion the stimulus that caused the illusion does exist in the real world. Although hallucinations are a key diagnostic feature of schizophrenia, a mental disorder that distorts the way a person thinks, acts, expresses emotions, perceives reality, and relates to others, they can occur in individuals devoid of any physical or mental disorder.In order to understand why people hallucinate, some researchers have been studying people suffering from what is called the phantom limb syndrome, a condition in which people who have undergone amputation feel as though the missing body part were still very much present and attached to the body; for instance, it is not uncommon for a person who has lost a leg to unknowingly try to stand and walk without any external support after their surgery. One of the two main hypotheses behind the phantom limb syndrome offers an explanation that is possibly applicable to why people hallucinate in certain circumstances. As per this theory, the brain is programmed for a body where every body part is intact and in the appropriate place. Accordingly, when some signals go missing, because of the missing body part, the brain compensates for the lack of sensory input by triggering spontaneous nerve cell activity. Although this theory has limited applicability for understanding why patients such as those of schizophrenia hallucinate in conditions not deemed out of the ordinary, it is a step forward in understanding why people experience visual or auditory hallucinations when they are placed in solitary confinements; after all the different areas of the brain that were used to receiving signals through the senses start to stimulate themselves in to action.Which of the following is mentioned in the passage?a)Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.b)Hallucinations cannot be experienced at the same time as illusions.c)A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition.d)Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.e)An illusion happens after there has been a real external trigger for the same.Correct answer is option 'E'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of The generally agreed upon definition of hallucinations is that they are actually perceptions in the absence of an external stimulus of the relevant sensory organ. These perceptions are accompanied by a persuasive sense of their reality. Hallucinations are not to be confused with illusions, which are misinterpretations of actual external stimuli. In other words, in the case of a hallucination, for a person hallucinating a sound for instance, the sound actually exists, but in reality it exists nowhere but in the person’s mind; however, in the case of an illusion the stimulus that caused the illusion does exist in the real world. Although hallucinations are a key diagnostic feature of schizophrenia, a mental disorder that distorts the way a person thinks, acts, expresses emotions, perceives reality, and relates to others, they can occur in individuals devoid of any physical or mental disorder.In order to understand why people hallucinate, some researchers have been studying people suffering from what is called the phantom limb syndrome, a condition in which people who have undergone amputation feel as though the missing body part were still very much present and attached to the body; for instance, it is not uncommon for a person who has lost a leg to unknowingly try to stand and walk without any external support after their surgery. One of the two main hypotheses behind the phantom limb syndrome offers an explanation that is possibly applicable to why people hallucinate in certain circumstances. As per this theory, the brain is programmed for a body where every body part is intact and in the appropriate place. Accordingly, when some signals go missing, because of the missing body part, the brain compensates for the lack of sensory input by triggering spontaneous nerve cell activity. Although this theory has limited applicability for understanding why patients such as those of schizophrenia hallucinate in conditions not deemed out of the ordinary, it is a step forward in understanding why people experience visual or auditory hallucinations when they are placed in solitary confinements; after all the different areas of the brain that were used to receiving signals through the senses start to stimulate themselves in to action.Which of the following is mentioned in the passage?a)Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.b)Hallucinations cannot be experienced at the same time as illusions.c)A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition.d)Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.e)An illusion happens after there has been a real external trigger for the same.Correct answer is option 'E'. Can you explain this answer?, a detailed solution for The generally agreed upon definition of hallucinations is that they are actually perceptions in the absence of an external stimulus of the relevant sensory organ. These perceptions are accompanied by a persuasive sense of their reality. Hallucinations are not to be confused with illusions, which are misinterpretations of actual external stimuli. In other words, in the case of a hallucination, for a person hallucinating a sound for instance, the sound actually exists, but in reality it exists nowhere but in the person’s mind; however, in the case of an illusion the stimulus that caused the illusion does exist in the real world. Although hallucinations are a key diagnostic feature of schizophrenia, a mental disorder that distorts the way a person thinks, acts, expresses emotions, perceives reality, and relates to others, they can occur in individuals devoid of any physical or mental disorder.In order to understand why people hallucinate, some researchers have been studying people suffering from what is called the phantom limb syndrome, a condition in which people who have undergone amputation feel as though the missing body part were still very much present and attached to the body; for instance, it is not uncommon for a person who has lost a leg to unknowingly try to stand and walk without any external support after their surgery. One of the two main hypotheses behind the phantom limb syndrome offers an explanation that is possibly applicable to why people hallucinate in certain circumstances. As per this theory, the brain is programmed for a body where every body part is intact and in the appropriate place. Accordingly, when some signals go missing, because of the missing body part, the brain compensates for the lack of sensory input by triggering spontaneous nerve cell activity. Although this theory has limited applicability for understanding why patients such as those of schizophrenia hallucinate in conditions not deemed out of the ordinary, it is a step forward in understanding why people experience visual or auditory hallucinations when they are placed in solitary confinements; after all the different areas of the brain that were used to receiving signals through the senses start to stimulate themselves in to action.Which of the following is mentioned in the passage?a)Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.b)Hallucinations cannot be experienced at the same time as illusions.c)A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition.d)Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.e)An illusion happens after there has been a real external trigger for the same.Correct answer is option 'E'. Can you explain this answer? has been provided alongside types of The generally agreed upon definition of hallucinations is that they are actually perceptions in the absence of an external stimulus of the relevant sensory organ. These perceptions are accompanied by a persuasive sense of their reality. Hallucinations are not to be confused with illusions, which are misinterpretations of actual external stimuli. In other words, in the case of a hallucination, for a person hallucinating a sound for instance, the sound actually exists, but in reality it exists nowhere but in the person’s mind; however, in the case of an illusion the stimulus that caused the illusion does exist in the real world. Although hallucinations are a key diagnostic feature of schizophrenia, a mental disorder that distorts the way a person thinks, acts, expresses emotions, perceives reality, and relates to others, they can occur in individuals devoid of any physical or mental disorder.In order to understand why people hallucinate, some researchers have been studying people suffering from what is called the phantom limb syndrome, a condition in which people who have undergone amputation feel as though the missing body part were still very much present and attached to the body; for instance, it is not uncommon for a person who has lost a leg to unknowingly try to stand and walk without any external support after their surgery. One of the two main hypotheses behind the phantom limb syndrome offers an explanation that is possibly applicable to why people hallucinate in certain circumstances. As per this theory, the brain is programmed for a body where every body part is intact and in the appropriate place. Accordingly, when some signals go missing, because of the missing body part, the brain compensates for the lack of sensory input by triggering spontaneous nerve cell activity. Although this theory has limited applicability for understanding why patients such as those of schizophrenia hallucinate in conditions not deemed out of the ordinary, it is a step forward in understanding why people experience visual or auditory hallucinations when they are placed in solitary confinements; after all the different areas of the brain that were used to receiving signals through the senses start to stimulate themselves in to action.Which of the following is mentioned in the passage?a)Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.b)Hallucinations cannot be experienced at the same time as illusions.c)A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition.d)Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.e)An illusion happens after there has been a real external trigger for the same.Correct answer is option 'E'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice The generally agreed upon definition of hallucinations is that they are actually perceptions in the absence of an external stimulus of the relevant sensory organ. These perceptions are accompanied by a persuasive sense of their reality. Hallucinations are not to be confused with illusions, which are misinterpretations of actual external stimuli. In other words, in the case of a hallucination, for a person hallucinating a sound for instance, the sound actually exists, but in reality it exists nowhere but in the person’s mind; however, in the case of an illusion the stimulus that caused the illusion does exist in the real world. Although hallucinations are a key diagnostic feature of schizophrenia, a mental disorder that distorts the way a person thinks, acts, expresses emotions, perceives reality, and relates to others, they can occur in individuals devoid of any physical or mental disorder.In order to understand why people hallucinate, some researchers have been studying people suffering from what is called the phantom limb syndrome, a condition in which people who have undergone amputation feel as though the missing body part were still very much present and attached to the body; for instance, it is not uncommon for a person who has lost a leg to unknowingly try to stand and walk without any external support after their surgery. One of the two main hypotheses behind the phantom limb syndrome offers an explanation that is possibly applicable to why people hallucinate in certain circumstances. As per this theory, the brain is programmed for a body where every body part is intact and in the appropriate place. Accordingly, when some signals go missing, because of the missing body part, the brain compensates for the lack of sensory input by triggering spontaneous nerve cell activity. Although this theory has limited applicability for understanding why patients such as those of schizophrenia hallucinate in conditions not deemed out of the ordinary, it is a step forward in understanding why people experience visual or auditory hallucinations when they are placed in solitary confinements; after all the different areas of the brain that were used to receiving signals through the senses start to stimulate themselves in to action.Which of the following is mentioned in the passage?a)Hallucinations are caused by chemical imbalances in the brain, imbalances typical of people with mental disorders.b)Hallucinations cannot be experienced at the same time as illusions.c)A person suffering from the phantom limb syndrome is likely to suffer from hallucination at some point during the condition.d)Auditory and visual hallucinations are the two most common types of hallucinations experienced by people in solitary confinement.e)An illusion happens after there has been a real external trigger for the same.Correct answer is option 'E'. 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