what does y mean in the psychometric function
lower asymptote
In psychophysics, the psychometric function refers to the mathematical relationship between the physical properties of a stimulus and an individual’s perceptual response to the stimulus. The psychometric function is typically observed by asking individuals to make categorical judgments (e.g., “yes” or “no,” or “left” or “right”) about a given sensory stimulus presented in different intensities.
In this context, the “y” variable in the psychometric function is typically used to refer to the proportion of correct responses that participants give at each stimulus intensity. Specifically, the psychometric function plots the proportion of the participants’ “yes” or “correct” responses (i.e., the “y” variable) as a function of the stimulus intensity (i.e., the “x” variable).
By plotting the psychometric function, researchers can examine how sensory information is processed, how perceptual thresholds vary across participants and sensory domains, and how decision-making processes contribute to perceptual judgments. Therefore, the y variable in the psychometric function is an essential aspect of psychophysical research, providing information on participants’ performance and their perceptual sensitivity to sensory stimuli.
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