PSYO 111 Lecture Notes - Lecture 4: Detection Theory, Absolute Threshold, Color Blindness

• School: UBC Okanagan, UBC OK
• Department: Psychology
• Course: PSYO 111
• Professor: Maya Libben

Document Summary

Perception the organization, identification and interpretation of a sensation in order to form a mental representation. Transduction when many sensors in the body convert physical signals from the environment into encoded neural signals sent to the cns. The perceptual experience of one sense that is evoked by another sense. E. g. certain words/letters have certain colour, numbers have textures, tasting certain sounds. Occurs in 1 out of 100 people fmri results provide corroborative evidence. Brain regions for different sensory modalities cross-activate each other. Methods that measure the strength of a stimulus and the observer"s se(cid:374)sitivit(cid:455) to that sti(cid:373)ulus. Typical experiment: ask people to make a perceptual judgment. E. g. (cid:862)did (cid:455)ou see a flash of light(cid:863) Absolute threshold the minimal intensity needed to just barely detect a stimulus. Absolute threshold for sensation = sensing or not sensing. To determine the absolute threshold of sound, a tone is repeated at increasing volume and/or duration until it is perceived.