Kinesiology 3480A/B Lecture Notes - Lecture 27: Two-Streams Hypothesis, Posterior Parietal Cortex, Motor System
19 Oct 2016
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Document Summary
The nervous system topic #6 - closed-loop motor control part 6. Hollow face illusion: ventral visual system (perceptual visual system) is tricked by relative and context dependent features. I. e. if an individual is asked to reach out and touch nose they not tricked. Dorsal visual system uses information in the posterior parietal cortex which does not pertain relative or context dependent features - only maintains absolute object properties. Ponzo illusions: perceptual system is tricked because it works in a relative frame of reference. When looking at box b, you look at it relevant to the railway tracks it appears smaller because the tracks are wider. When looking at box a, the railways tracks are converging thus making box a appear larger: motor system would not be tricked by this illusion because it works in an absolute frame of reference. The peak grip aperture does not vary as a function of grasping box a or box b.
