Binocular stimulation and response variability of striate cortex units in the cat

1970 ◽  
Vol 10 (11) ◽  
pp. 1145-1153 ◽  
Author(s):  
M.L.J. Crawford ◽  
Steven J. Cool
Keyword(s):  
Striate Cortex ◽  
Response Variability ◽  
Binocular Stimulation

Orientation specificity and response variability of cells in the striate cortex

1973 ◽  
Vol 13 (9) ◽  
pp. 1771-1779 ◽  
Author(s):  
G.H. Henry ◽  
P.O. Bishop ◽  
R.M. Tupper ◽  
B. Dreher
Keyword(s):  
Striate Cortex ◽  
Response Variability ◽  
Orientation Specificity

Contrast coding by cells in the cat's striate cortex: Monocular vs. binocular detection

1995 ◽  
Vol 12 (1) ◽  
pp. 77-93 ◽  
Author(s):  
Akiyuki Anzai ◽  
Marcus A. Bearse ◽  
Ralph D. Freeman ◽  
Daqing Cai
Keyword(s):  
Contrast Sensitivity ◽  
Small Proportion ◽  
Behavioral Contrast ◽  
Striate Cortex ◽  
Binocular Summation ◽  
Characteristic Analysis ◽  
Physiological Basis ◽  
Contrast Detection ◽  
Binocular Stimulation ◽  
Contrast Thresholds

AbstractMany psychophysical studies of various visual tasks show that performance is generally better for binocular than for monocular observation. To investigate the physiological basis of this binocular advantage, we have recorded, under monocular and binocular stimulation, contrast response functions for single cells in the striate cortex of anesthetized and paralyzed cats. We applied receiver operating characteristic analysis to our data to obtain monocular and binocular neurometric functions for each cell. A contrast threshold and a slope were extracted from each neurometric function and were compared for monocular and binocular stimulation. We found that contrast thresholds and slopes varied from cell to cell but, in general, binocular contrast thresholds were lower, and binocular slopes were steeper, than their monocular counterparts. The binocular advantage ratio, the ratio of monocular to binocular thresholds for individual cells, was, on average, slightly higher than the typical ratios reported in human psychophysics. No single rule appeared to account for the various degrees of binocular summation seen in individual cells. We also found that the proportion of cells likely to contribute to contrast detection increased with stimulus contrast. Less contrast was required under binocular than under monocular stimulation to obtain the same proportion of cells that contribute to contrast detection. Based on these results, we suggest that behavioral contrast detection is carried out by a small proportion of cells that are relatively sensitive to near-threshold contrasts. Contrast sensitivity functions (CSFs) for the cell population, estimated from this hypothesis, agree well with behavioral data in both the shape of the CSF and the ratio of binocular to monocular sensitivities. We conclude that binocular summation in behavioral contrast detection may be attributed to the binocular superiority in contrast sensitivity of a small proportion of cells which are responsible for threshold contrast detection.

Tetraploidy and the striate cortex

Pathology ◽  
1977 ◽  
Vol 9 (2) ◽  
pp. 99-104 ◽  
Author(s):  
C.L. Scholtz
Keyword(s):  
Striate Cortex

Characterizing Response Variability and Method Uncertainty in Odour Perception Research

1999 ◽  
Vol 40 (6) ◽  
pp. 99-105
Author(s):  
Cynthia G. Jardine ◽  
Steve E. Hrudey
Keyword(s):  
Oil Sands ◽  
Detection Method ◽  
Response Variability ◽  
Fish Flesh ◽  
Odour Perception

Data previously collected to determine odour thresholds in fish flesh for individual contaminants identified as possible fish tainting substances from oil sands wastewaters were reanalyzed to determine both the variability in response for an 11 member panel and the range of uncertainty for the detection method. Results are presented for 8 compounds: naphthalene, 1-methylnaphthalene, 2,6-dimethylnaphthalene, 2,3,5-trimethylnaphthalene, 1.4-dimethylbenzene, benzothiophene, dibenzothiophene and 2,5-dimethylphenol. These results demonstrate that substantial variability was present in responses from a group of only 11 panelists who were selected for their sensitivity and consistency, while method uncertainty was tolerably narrow.

Sign in / Sign up

Export Citation Format

Share Document