PSY100Y5 Lecture Notes - Lecture 5: Aqueous Humour, Absolute Threshold, Retina

• School: UTM
• Department: Psychology
• Course: PSY100Y5
• Professor: Dax Urbszat

Document Summary

Sensation is same for all of us, perception is different (what we select, unconsciously) Perception: selection, organization and interpretation of sensory input. Thresholds sensory receptors are tuned to a particular form of energy. Auditory receptors in the ear code for sound pressure changes, not for light. Sensory systems require a minimum amount of energy for activation (absolute threshold) 50% of trials. Just noticeable difference (jnd): the minimum difference in stimulation that is just noticeable. Weber noted that the jnd is a fraction of the original stimulus intensity: the fraction is different for different senses. Allows for detection of movement (predator or prey) Allows for detection of color (ripe or spoiled?) Light travels rapidly (no delay, unlike hearing) Light travels in straight lines (no distortion) Light interacts with the surfaces of objects in the environment (is reflected or absorbed) Cornea: protects eye, and holds in aqueous humor (liquids of eye/ watery)