Sensation and Perception Quiz 4 study guide PDF

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Summary

Psychophysics, Absolute threshold, Ideal threshold, Difference threshold, Gustav Fechner, Transduction, Ewald Hering and sensory adaption....

Description

Sensation and Perception ● Sensation is the detection and encoding of stimuli ● Psychophysics: physical study of the mind Absolute threshold: the minimum magnitude of stimulus that can be detected 50% of the time.

**Percentage of detections= percentage of trials where the stimulus was detected/noticed

Difference Threshold: the minimum amount a stimulus must change in order for the change in sensation to be detected 50% of the time ●

The absolute threshold is really just a special type of a difference threshold

Weber Function: The amount of stimulation necessary to result in a “just noticable difference” s a constant fraction of the stimulus intensity Example. for weight… k- 1/50 (the Weber Fraction) 1 lb./50lb. =2lb/100lb.= 1/5lb./10lb. The Weber Fraction varies with sensory modality Jnds are units of psychological changes in sensation Gustav Fechner proposed a law describing the relationship between psychological and physical events: s=k log I … S (psychological units: jnds), k (Weber fraction) log I (physical: units: lbs)...