The Open Library by Center for Learning

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For example, it has been shown that the activity of the R3 cells is quite complicated. To a first approximation it can be viewed as responding to the leading edge of a moving object entering its receptive field (the region of the visual field in which activity can affect the activity of the cell), rather than the presence of a prey-like object within the receptive field. Again (and this was already recognized by Lettvin et al, 1959) the activity of the R4 cell can be better interpreted as just a measure of dimming — but clearly a predator by casting a larger shadow will dim the receptive field more than prey and thus excite the R4 cell more strongly.

Note that these are very different inputs, since the somatosensory input depends on the position of body and limbs, while position in auditory input is timecoded via the difference of arrival of signals at the two ears. Mapping the input into visual coordinates thus seems complex in the former case, comparatively simple in the latter. The colliculus is intimately related with the pulse generators: the projection from superior colliculus to long lead bursters is monosynaptic, while the latency from deep superior colliculus activity to motoneurons is polysynaptic.

36 Neural Modeling and Neural Networks Scudder (1988) developed an alternative model for the saccade generator which addresses the issue of spatial coding in superior colliculus. ) The output of the superior colliculus is integrated by a neural integrator composed of long lead burster neurons (LLBN) — the integration is shown schematically by self-excitation with unit weight. The retinotopic code of saccade size in superior colliculus is converted to an intensity code by differentially weighting the output of collicular neurons according to the eccentricity of each superior colliculus neuron's movement field.

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