Ciba Foundation Symposium 184 - Higher-Order Processing in by CIBA Foundation Symposium

By CIBA Foundation Symposium

Most advantageous neurophysiologists and psychophysicists offer pertinent details at the nature of illustration on the earliest phases as this may constrain the disposition of all next processing. This processing is mentioned in different types of visible belief.

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800 *I. loo0 200 4W msec 6W 800 lOW - 0 S-cone isolating S-cone isolating FIG. 4. Intracellular recordings from parasol and midget and small bistratified ganglion cells in an in vitro preparation of the macaque (Macaca nemestrina) retina. (a) Response of a phasic cell identified morphologically as an outer parasol cell to the output of red and green light-emitting diodes (LEDs) modulated sinusoidally in phase at 10 Hz (Dacey & Lee 1994). The cell gave a phasic OFFresponse and hyperpolarized in response to luminance increment.

01). The Xs mark the foveal position. Reprinted from Gilbert & Wiesel (1992). We studied spatial localization around an artificial scotoma in human psychophysical experiments (Kapadia et a1 1994). In experiments analogous to the physiological studies, we asked subjects to determine the position of short line segments in the vicinity of an artificial scotoma. Lines located near the boundary of the scotoma appear to be shifted towards the centre of the scotoma. The perceived shift may be related to expansion of receptive fields within the scotoma: if each cell represents a ‘labelled line’ for a particular visuotopic location, for example the centre of their receptive fields, when a group of cells 50 G iIbert FIG.

Long-term changes in cortical topography When the visual system receives changes in sensory experience for an extended period of time, even more dramatic alterations in receptive fields and cortical functional architecture can be seen. This is most dramatically shown when one makes lesions of the periphery. Initially, when sensory input is removed by retinal lesions, an area of cortex is left silenced, devoid of functioning input. Over a period of a few months, the silenced area recovers function, and it develops a representation of a different part of the retina than it represented before the lesion.

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