L33 Psych 330 Lecture 3: Lecture 3
Document Summary
Jnd threshold is proportional to the intensity of the standard. Jnd is the basic unit of perception a. Need a larger stimulus to produce a jnd further on. There is a function that better describes the relation between physical stimulus magnitude and perception for a wide range of stimulus modalities. Present a standard stimulus and assign it an arbitrary number. Present another stimuli and subject assigns each a number relative to the standard. Equal increments in physical intensity produce smaller and smaller increments in perceived magnitude the standard. Can be informative about the relation between physical stimulus attributes and perceived magnitude for almost any sensory quality. If n > 1, as physical intensity increases, perceived intensity. Response expansion increases at an increasing rate. (equal increments in physical intensity p larger increments in perceived intensity. ) If n = 1, as physical intensity increases, perceived intensity increases at a c.
