Behavior

In psychology, behavior is what an organism does, described through actions or responses in a specified setting. A keypress, a spoken answer and a shift of gaze can all be measured, but they provide different evidence about the processes producing them. An operational definition states what will count as the response in a particular investigation.

For an original example, a learning task might measure how often a participant chooses a rewarded symbol and how long each choice takes. Choice frequency and reaction time are distinct outcomes: two participants can make equally accurate choices while taking different amounts of time. Neither measure alone establishes whether a difference arises from attention, comprehension, motivation or motor demands. The interpretation requires a model and suitable comparison conditions.

This distinction is central to construct validity: recording a response reliably does not by itself show that it measures the intended psychological construct. A report of an emotion is also a response to a question, rather than an unmediated measurement of every component of the emotion.