Psychology 2115A/B Lecture : 2115a Lec 2.doc

• School: Western University
• Department: Psychology
• Course: Psychology 2115A/B
• Professor: N/ A

Document Summary

Detection: how much activity do you need in your system to know there was a stimulus there. Absolute threshold: if you presence a stimulus thats less intensity than threshold you will not feel any- thing (point where you can perceive stimulus) Psychometric function: measuring relationship between physical and psychological. Errors of abitruation: saying yes/no more than you should. Error of anticipation: anticipate that the trial will be same as previous. Time order error: method of constant stimuli: random unpredictable presentation of trials, continuous s-shape curve, p(50%) used as absolute threshold to measure (interpolation) Stimulus causes different levels of activity in nervous system. Point of objective equality (poe): 2 stimulus per trial. Standard stimulus: first stimulus is always the same. Just noticeable difference: the amount of difference needed to notice a difference. Interval of uncertainty: when comparison stimulus stimulus is in a interval we do not know the specific point of. Point of subjective equality (pse): mid-point of interval of uncertainty.