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| Question | Answer |
| First research done on the horseshoe crab looked at what? | The receptive fields, their excitations, and their lateral inhibitions. |
| ommatidium | were more excited when a single pencil thin light was shone on one ommatidium, less so when also simultaneously shone on adjacent ommatidia. |
| The reduced excitation of receptors due to adjacent stimulation is referred to as? | lateral inhibition/lateral antagonism |
| The resting rate of a ganglion cell | is still slightly firing. |
| On-centre off-surround receptive feilds | Have excitatory receptors in the center and inhibitory receptors in the surrounding area. |
| When on-center off-surround receptive fields are stimulated solely in their center it results in? | The highest level of excitation |
| on-center off-surround stimulated in the center and on one half of the surround? | results in excitation equal to resting rates. |
| on-center off-surround stimulated only in the surround | ganglion cell does not fire |
| on-centre off-surround entire receptive filed stimulated | weak excitation |
| Cortical cells are present where? and what was found among them? | The are present in the visual cortex and cortical cells which fired when stimuli was present at a certain angle. |
| Perceptual consequences of lateral inhibition | Mach bands, Chevreul staircase |
| How is the perceptual experience of mach bands explained? | At edges, the receptive field is placed over top of the contour. The resulting ganglion cell adjacent to the contour on the lighter side is then perceive as being even brighter than the rest of the right side because it is receiving less lateral inhibition from its off-surround which is still on the dark side of the edge. |
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