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A cortical area that responds specifically to optic flow, revealed by fMRI
The continuously changing optic flow on the retina provides information about direction of heading and about the three-dimensional structure of the environment. Here we use functional magneticExpand
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Perceptual learning specific for orientation and spatial frequency
Several examples of ‘perceptual learning’ (improvement of some perceptual task with practice) have been reported1–4. These studies are of great interest (for neurological research because theyExpand
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The visual cortex as a spatial frequency analyser.
Abstract Unitary responses to sinusoidal gratings either moving or alternating in phase have been investigated in the optic tract, lateral geniculate body and visual cortex of the cat as a functionExpand
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The unresponsive regions of visual cortical receptive fields
Abstract We have recorded from simple and complex cells in area 17 of the cat cortex. Around the classical receptive field (regions within which a moving or flashing bar can elicit a response from aExpand
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Behavioural visual acuity of wild type and bcl2 transgenic mouse
Since the advent of gene manipulating techniques, it has become increasingly important to study the neural functional properties of the mouse. The bcl2 gene has a powerful inhibitory action onExpand
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Learning in grating waveform discrimination: Specificity for orientation and spatial frequency
Abstract The effects of practice in the discrimination of briefly flashed gratings were investigated by a forced-choice procedure with error correction in a number of tasks requiring disciminationExpand
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Neural Correlate of Perceptual Adaptation to Gratings
Exposure of simple cells of the cat striate cortex to high-contrast drifting gratings greatly reduces the subsequent response of the cells to low-contrast gratings. This adaptation effect has anExpand
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Lack of cortical contrast gain control in human photosensitive epilepsy
Television and video games may be powerful triggers for visually induced epileptic seizures. To better understand the triggering elements of visual stimuli and cortical mechanisms ofExpand
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Visual Ageing: Unspecific Decline of the Responses to Luminance and Colour
We have investigated whether ageing affects selectively the responses to equiluminant patterns of pure colour contrast. In two groups of subjects (mean ages 29 and 72 yr) contrast thresholds wereExpand
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Reaction time to motion onset of luminance and chromatic gratings is determined by perceived speed
We measured reaction times for detecting motion onset for sinusoidal gratings whose contrast was modulated in either luminance or chromaticity, for various drift rates and contrasts. In general,Expand
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