A collection of fragments of understanding in the pursuit of deeper questions.
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The Receptive Field of a cell is the region of visual space in which light can affect (increase or decrease) the cell's firing frequency. The further we go away from the retina, the wider the receptive fields of the cells increase. Ganglion cells do not receive light directly, they receive signals from the photoreceptors. The photoreceptors projecting to a single ganglion cell are a round area of the retina. Half of these receptive fields present an On-center surrounded by an Off-region, while the other half presents an opposite. The On-center fires to increase in light intensity, while Off-surround regions fire to decrease in light intensity.
Cortical Receptive Fields Orientation-sensitive cortical cell. This cell responds strongly only when the stimulus is a vertical stripe. Due to the shape of cortical receptive fields, the stimuli that strongly excite the cells are bars rather than spots of lights. They are edge-detectors.
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