The main types of assessment measures used by psychologists to study the outcomes of mental activity are behavioral, self-report, and physiological measures.

1. Behavioral Measures:
- Behavioral measures involve observing and recording an individual's actions or behaviors. This can include tasks, tests, or activities that require a person to perform certain actions or respond to specific stimuli.
- These measures provide objective data about an individual's behavior and can be used to assess cognitive abilities, problem-solving skills, social interactions, and other aspects of mental activity.
- Examples of behavioral measures include performance on cognitive tasks, completion of puzzles or tests, and observation of social interactions.

2. Self-Report Measures:
- Self-report measures involve individuals providing information about their thoughts, feelings, behaviors, or experiences through questionnaires or interviews.
- These measures rely on individuals' self-perception and self-awareness, allowing them to reflect on their mental activity and provide subjective information.
- Self-report measures can assess various aspects of mental activity, including attitudes, beliefs, emotions, personality traits, and symptoms of mental disorders.
- Examples of self-report measures include personality inventories, depression or anxiety scales, and questionnaires assessing attitudes or opinions.

3. Physiological Measures:
- Physiological measures involve the assessment of physiological responses and changes in the body that are associated with mental activity.
- These measures provide objective data about the functioning of the nervous system, brain activity, and bodily responses to various stimuli or tasks.
- Physiological measures can include techniques such as electroencephalography (EEG), functional magnetic resonance imaging (fMRI), heart rate monitoring, skin conductance, and eye tracking.
- These measures can help psychologists understand the neural processes underlying mental activity, such as attention, perception, memory, emotion, and decision-making.

The combination of these assessment measures allows psychologists to gather comprehensive information about the outcomes of mental activity. Behavioral measures provide objective observations, self-report measures capture subjective experiences, and physiological measures offer insights into the underlying neural processes. By utilizing these different types of measures, psychologists can gain a more complete understanding of human cognition, behavior, and mental health.