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The spatial-frequency theory refers to the theory that the visual cortex operates on a code of spatial frequency, not on the code of straight edges and lines hypothesised by Hubel and Wiesel on the basis of early experiments on V1 neurons in the cat.
The communication accommodation theory has broadened this theory to include not only speech but also the "non-verbal and discursive dimensions of social interaction". [10] CAT has also created a different perspective from other research in language and social interaction—and communication more generally—that focuses on either interpersonal ...
At the time of De Valois' move to Berkeley, linear systems analysis was emerging as a tool for studying the early stages of visual processing. Although this technique had long been applied to problems in optics and engineering, vision scientists Fergus Campbell and John Robson [17] measured human sensitivity to patterns of spatial sinusoidal gratings of varying periodicity and first proposed ...
For example, simple cells in the visual cortex of the domestic cat (Felis catus), respond to edges—a feature which is more likely to occur in objects and organisms in the environment. [1] By contrast, the background of a natural visual environment tends to be noisy—emphasizing high spatial frequencies but lacking in extended edges.
The 50% cutoff frequency is determined to yield the corresponding spatial frequency. Thus, the approximate position of best focus of the unit under test is determined from this data. The MTF data versus spatial frequency is normalized by fitting a sixth order polynomial to it, making a smooth curve.
The flicker fusion threshold, also known as critical flicker frequency or flicker fusion rate, is the frequency at which a flickering light appears steady to the average human observer. It is a concept studied in vision science , more specifically in the psychophysics of visual perception .
By introducing large-angle disinhibition, [4] [21] this theory could also be used to explain indirect tilt effects. Around the 1970s, this theory has been developed into lateral inhibition theory by Blakemore et al. [22] [23] As in the visual cortex of the cat or the monkey, [24] [25] there are also orientation detectors in the human brain. Any ...
The brain of the domesticated cat is about five centimetres (2.0 in) long and weighs 25–30 g (0.88–1.06 oz). [1] [2] If a typical cat is taken to be 60 cm (24 in) long with a weight of 3.3 kg (7.3 lb), then the brain would be at 0.91% [3] of its total body mass, compared to 2.33% [3] of total body mass in the average human.