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Unformatted text preview: IX. Visual System IX.A. Eyes IX.A.1. Compound Insects and other arthropods have compound eyes. Compound eyes are made up of many ommatidia which are small individual retinas. Each ommatidium is looking at a slightly different but overlapping region of visual space. The fly eye toys which are being passed around the class give you an idea of what the fly’s eye sees. Shown above is a scene that a fly might look at., a piece of pizza. Indicated on this scene are the views seen by three of the fly’s ommatidia. As you can tell from the fly’s eye toys, this is a very confusing view of the world. Each ommatidia is like a separate retina with many light receptors Receptive field looking at olive Receptive field looking at pepperoni The fly’s brain constructs this map which makes sense. IX.A.1. Compound eyes In order to make sense of this confusing view, the fly’s nervous system connects up receptor cells within several ommatidia which are looking at the same part of the visual scene, that is cells with the same receptive fields. Using this method the fly’s brain constructs a congruent map of at the same part of the visual scene, that is cells with the same receptive fields....
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- Fall '08
- Neurobiology, Photoreceptor cell