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By Veronika Coltheart (Ed.)

ISBN-10: 1848728530

ISBN-13: 9781848728530

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Extra resources for Tutorials in Visual Cognition

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Eggermont, J. J. (1990). The correlative brain. Berlin: Springer–Verlag. Enns, J. , & Di Lollo, V. (1997). Object substitution: A new form of masking in unattended visual locations. Psychological Science, 8, 135–139. Felleman, D. , & Van Essen, D. C. (1991). Distributed hierarchical processing in primate visual cortex. Cerebral Cortex, 1, 1–47. Frisby, J. (1980). Seeing. Illusion, brain and mind. Oxford: Oxford University Press. , & Rizzolatti, G. (1996). Action recognition in premotor cortex. Brain, 119, 593–609.

The descending projections are connected to the corresponding LGN cells in such a way as to facilitate the firing of cells located next to the initial source cell in the direction to which the cortical motion sensor is optimally tuned. This circuitry provides an anticipatory coordinating influence by lowering the firing threshold of the LGN cells that are about to be activated by the moving grating. 5(c). The main point to be gathered from this discussion is that, even in the absence of physical stimulation, reentrant signals to LGN can prepare the system for a stimulus that is about to occur at a location in the expected path of motion.

First, the primary visual cortex contains a very large number of motion sensors that are set in many different orientations and are optimally tuned to different spatial and temporal frequencies. 5(a) been oriented differently or moved in a different direction, another suitably tuned motion sensor would have been activated in Area 17. The second consideration pertains to the wiring between primary visual cortex and LGN. Each motion unit in Area 17 projects to both higher and lower brain regions.

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Tutorials in Visual Cognition by Veronika Coltheart (Ed.)

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