PSY 1305 Lecture 9: psych chapter 6 (upload)
9 Feb 2017
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Sensation and perception are parts of one continuous process: sensation. All our senses: receive sensory stimulation, transform that stimulation into neural impulses. Transduction: conversion of one form of energy into another. Signal detection theory: predicts how and when we will detect a faint stimulus amid background noise. Absolute threshold: minimum stimulation needed to detect a particular stimulus 50% of the time. Sensory adaption: diminished sensitivity as a consequence of constant stimulation: aids focus by reducing background chatter. Subliminal: stimuli below the absolute threshold for conscious awareness. Priming: activating, often unconsciously, associations in our mind. Difference threshold (just noticeable different-jnd: minimum difference a person can detect between any two stimuli half the time; increases with stimulus size. We(cid:271)er"s la(cid:449: for an average person to perceive a difference, two stimuli must differ by a constant minimum percentage (not a constant amount) Perceptual set: mental tendencies and assumptions that affect what we hear, taste, feel, and see.
