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ZOL 313 Week 6

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by: Elaine Foster

ZOL 313 Week 6 ZOL 313

Elaine Foster
Blue Mountain State
GPA 3.76
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About this Document

Week 6 Notes Sensory Systems (cont.) Eyes (basic components, color/spatial vision, color & shape, distance perception)
Animal Behavior
Dr. Dyer
Class Notes




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Chris Chess

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This 1 page Class Notes was uploaded by Elaine Foster on Sunday February 22, 2015. The Class Notes belongs to ZOL 313 at Michigan State University taught by Dr. Dyer in Fall. Since its upload, it has received 162 views. For similar materials see Animal Behavior in Animal Science at Michigan State University.

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Date Created: 02/22/15
ZOL 313 (Animal Behavior) Mechanisms  Eyes o Basic components of an eye  Aperture --> windows to let in light (size can vary)  Focusing element (lens, pinhole, etc.)  Retina --> array of photoreceptors o Eye designs: differences in arrangement of photoreceptor arrays & focusing elements o Color vision  Visual spectrum  Tuning: necessary for color vision (but not sufficient)  Single tuning curve is ambiguous  Compare output from multiple tuning curves  Different species have different visual spectra (different sets of photopigments) o Humans --> “trichromatic” o Spatial vision  Spatial vision involves detection of patterns of light and dark (high and low photon flux)  This requires a retina --> “bit map”  Neural circuits underlying spatial vision  Retina --> receptive field --> integrative neuron --> feature detector  Cells responsive to complex features take converging input from retinal cells responsive to single features o Edges, lines, moving edges, shapes, faces  Array of feature detectors at higher brain region correspond to more specific/complex shapes o Color & Shape  Bees see ultraviolet, and flowers have evolved conspicuous patterns that are only visible in UV  These patterns may help direct bees to nectar  Complex Spatial Vision  “Interpreting” the world rather than merely recording it o Shape from shading (2D that looks like 3D) o Shading from shape (same shade/color looking different because of shape or separation)  Distance Perception o How do we know how far away an object is from its image in our retinae?  Occlusion  Perspective (angles, proportions, contextual knowledge)  Detail/visual contrast  Shadows  Stereopsis  Vergence (requires 2 eyes)  Lens accommodation (requires 2 eyes)


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