02 Physiology and Brightness

02 Physiology and Brightness - 02 Physiology and Brightness...

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02 Physiology and Brightness I. Receptive Fields and Sight a. Ganglion cells receive information from multiple photo-receptors, creating a sort of receptive field of activation for each ganglion cell b. c. Qualities of The Receptive Field: i. The receptive field is most often disk-shaped ii. The cell is either “on-center-off surrounding” or “off-center-on-surrounding” 1. On = excitatory; off = inhibitory iii. The excitatory and inhibitory quality of the receptive field is additive, determining the activation of the ganglion cell 1. This is meant to filter out unimportant info and to zone in on specific info iv. Size Tuning – the receptive field is specifically turned to react more excitedly to certain sizes and shapes of light. 1. 2. The receptive field gets smaller as it gets closer to the fovea (some ganglion receptive field gets to a one photo-receptor size) v. Neural Divergence – one thing affects many things at a subsequent levels vi. Neural Convergence – many things affect just one or fewer thing(s) at subsequent levels
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02 Physiology and Brightness - 02 Physiology and Brightness...

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