scholarly journals Receptive-field properties of deafferentated visual cortical neurons after topographic map reorganization in adult cats

1995 ◽  
Vol 15 (3) ◽  
pp. 2417-2433 ◽  
Author(s):  
YM Chino ◽  
EL Smith ◽  
JH Kaas ◽  
Y Sasaki ◽  
H Cheng
Keyword(s):  
Receptive Field ◽  
Cortical Neurons ◽  
Topographic Map ◽  
Receptive Field Properties ◽  
Adult Cats ◽  
Visual Cortical

Responses of Primate Visual Cortical V4 Neurons to Simultaneously Presented Stimuli

2002 ◽  
Vol 88 (3) ◽  
pp. 1128-1135 ◽  
Author(s):  
Timothy J. Gawne ◽  
Julie M. Martin
Keyword(s):  
Visual Cortex ◽  
Receptive Field ◽  
Firing Rate ◽  
Cortical Neurons ◽  
Clear Relationship ◽  
Substantial Fraction ◽  
Receptive Field Properties ◽  
Direct Support ◽  
V4 Neurons ◽  
Visual Cortical

We report here results from 45 primate V4 visual cortical neurons to the preattentive presentations of seven different patterns located in two separate areas of the same receptive field and to combinations of the patterns in the two locations. For many neurons, we could not determine any clear relationship for the responses to two simultaneous stimuli. However, for a substantial fraction of the neurons we found that the firing rate was well modeled as the maximum firing rate of each stimulus presented separately. It has previously been proposed that taking the maximum of the inputs (“MAX” operator) could be a useful operation for neurons in visual cortex, although there has until now been little direct physiological evidence for this hypothesis. Our results here provide direct support for the hypothesis that the MAX operator plays a significant (although certainly not exclusive) role in generating the receptive field properties of visual cortical neurons.

Receptive-field properties of transcallosal visual cortical neurons in the normal and reeler mouse

1983 ◽  
Vol 50 (4) ◽  
pp. 838-848 ◽  
Author(s):  
P. A. Simmons ◽  
A. L. Pearlman
Keyword(s):  
Receptive Field ◽  
Cortical Neurons ◽  
Receptive Fields ◽  
Unit Recording ◽  
Stimulus Velocity ◽  
Bipolar Electrodes ◽  
Receptive Field Properties ◽  
Significant Difference ◽  
Visual Cortical ◽  
Normal Cortex

The receptive-field properties of neurons in the striate visual cortex of normal and reeler mutant mice were studied with single-unit recording methods in order to determine whether the connections underlying these properties are altered by the developmental abnormality in neuronal position that characterizes reeler neocortex. Neurons with a projection through the corpus callosum were selected for study because they form a physiologically identifiable class of visual cortical neurons with a characteristic distribution of receptive-field properties that can be compared for normal and reeler cortex. Transcallosal cortical neurons in area 17 near its border with area 18a were identified by antidromic stimulation delivered through bipolar electrodes in the contralateral cortex. A computer controlled the visual stimuli, data acquisition, and analysis. Transcallosal neurons were principally found in layers II-III and V in the normal cortex and in a broand band deep in the reeler cortex. These populations had similar distributions of antidromic latencies, indicating that the neurons sampled from normal and reeler cortex were taken from populations with similar axonal diameters and soma sizes. The receptive-field properties of 46 units in 22 normal mice and 28 units in 11 reeler mice were characterized. Transcallosal neurons in both normal and reeler cortex were usually binocularly responsive and dominated by input from the contralateral eye. They exhibited either nonoriented (31 and 48%, respectively) or oriented (69 and 52%) receptive fields. Tuning 10 stimulus velocity was broad, with peak velocity sensitivities ranging from 1 to 1,000 degrees/s. Directional selectivity was present in 41% of normal units ad 32% of reeler units. There was no significant difference between normal and reeler cortex in the distribution of these properties. Transcallosal neurons were also examined for the presence of an inhibitory surround by comparing their responses to moving or stationary stimuli of varying sizes. Of the tested neurons, most (11/17 in normal cortex, 6/9 in reeler) showed evidence of a decrease in response to large moving stimuli. A large proportion (16/20) of normal neurons tested with stationary flashing stimuli had some degree of surround inhibition whereas significantly fewer (5/17) neurons in reeler cortex had this property. Thus, transcallosal neurons in reeler cortex less frequently had an inhibitory surround demonstrable with stationary flashing stimuli, but this difference between normal and reeler was not apparent with a moving stimulus.(ABSTRACT TRUNCATED AT 400 WORDS)

scholarly journals Searching for object pointers in the visual cortex

2020 ◽  
Vol 123 (5) ◽  
pp. 1979-1994
Author(s):  
Shude D. Zhu ◽  
Li Alex Zhang ◽  
Rüdiger von der Heydt
Keyword(s):  
Visual Cortex ◽  
Receptive Field ◽  
Cortical Neurons ◽  
Visual Objects ◽  
Visual Cortical ◽  
The Way

The way we perceive objects as permanent contrasts with the short-lived responses of visual cortical neurons. A theory postulates pointers that give objects continuity, predicting a class of neurons that respond not only to visual objects but also when an occluded object moves into their receptive field. Here, we tested this theory with a novel paradigm in which a monkey freely scans an array of objects while some of them are transiently occluded.

Receptive field plasticity of area 17 visual cortical neurons of adult rats

2009 ◽  
Vol 199 (3-4) ◽  
pp. 401-410
Author(s):  
Ralph Leonhardt ◽  
Hubert R. Dinse
Keyword(s):  
Receptive Field ◽  
Cortical Neurons ◽  
Area 17 ◽  
Adult Rats ◽  
Visual Cortical

scholarly journals The effect of norepinephrine on visual cortical neurons in kittens and adult cats

1984 ◽  
Vol 4 (6) ◽  
pp. 1607-1617 ◽  
Author(s):  
TO Videen ◽  
NW Daw ◽  
RK Rader
Keyword(s):  
Cortical Neurons ◽  
Adult Cats ◽  
Visual Cortical
Sign in / Sign up

Export Citation Format

Share Document