PSY280H1 Chapter Notes - Chapter 12: Semicircular Canals, Angular Acceleration, Angular Velocity

• School: UTSG
• Department: Psychology
• Course: PSY280H1
• Professor: Dirk Bernhardt- Walther

Document Summary

Chapter 12 vestibular system & spatial orientation. 5 vestibular sense organs (3 semicircular canals, 2 otolith organs) Allows vesitubo-ocular reflex (vor reflex) stabilizes visual input by counter-rotating eyes to compensate for head movement. Spatial disorientation impairment of spatial orientation causes this (sense of linear motion, angular motion or tilt) Motion sickness dizziness, vertigo, imbalance, nausea caused by misalignment in visual and vestibular information. Spatial orientation a sense that consists of 3 interacting modalities: linear motion translational motion of head (up/down/left/right, angular motion rotational motion of head (cid:894)(cid:862)ya(cid:449)(cid:863)/(cid:863)pit(cid:272)h(cid:863)/(cid:863)roll(cid:863) = (cid:862)(cid:374)o(cid:863)/(cid:863)yes(cid:863)/(cid:863)(cid:374)e(cid:272)k (cid:272)ra(cid:272)k(cid:863)(cid:895, tilt sloped position, leaning, feel gravity. Sensory modalities have different receptors and different stimulation energy. 3 sensory/spatial orientation modalities = angular motion, linear motion, tilt. 3 sources of stimulating energy = angular acceleration, linear acceleration, gravity. Semicircular canals three toroid tubes that sense angular acceleration. Direction: orientation of maximum sensitivity perpendicular to canal plane. Amplitude: hair cell deflect more if higher angular acceleration **(both ways)