PSYC 4008 Chapter : HistPsych (Ch4 - Beg Ch5)
Document Summary
Psychophysics the study of the relationship between he perception of a stimulus event and the physical dimensions of the stimulus being perceived: originated in the sensory research of weber. Two-point threshold the point where the perception changes from feeling one point to feeling two. Small for skin areas of great sensitivity (i. e. thumb) Subjected mental events (sensations) to measurement and mathematical formulation: weber"s law jnd/s = k . Jnd just noticeable difference ; ex: difference between 30 and 33 grams. Depends on the relationship between a jnd and a standard stimulus (s) As a standard stimulus becomes heavier, there needs to be a greater difference between it and the comparison weight before a difference was noticed. If s = 30, difference will be recognized at 33 grams, jnd = 3. If s = 60, difference will be recognized at 66 grams, jnd = 6. If s = 90, difference will be recognized at 99 grams, jnd = 9.
