The Journal of Neuroscience, July 19, 2006, ():
Lack of Patchy Horizontal Connectivity in Primary Visual Cortex of a Mammal without Orientation Maps
J. Neurosci. Van Hooser et al.
26: 7680
Supplemental data
Files in this Data Supplement:
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Supplementary Figure 1. A scatterplot of the relationship between covariation strength and orientation preference difference and distance for recorded cell pairs. These data were presented in histogram form in Figure 6 to allow comparisons with T'so et al (1986). Left panel: covariation strength vs. orientation preference difference. In addition to the orientation-selective cells that were shown in Figure 6, this plot contains direction-selective cells that showed at least 3 times greater responses to the preferred direction as compared to the opposite direction. In direction-selective cells, orientation preference differences can take values between 0 and 180°. Right panel: covariation strength vs. cell pair distance. Distance measurements were made using histology for cells recorded using two independent electrodes, but the vast majority of cells were collected using bundles of electrodes or FHC matrix electrodes with tip displacements that were measured under a microscope. These displacements were taken to be the distances between the cells, and therefore many cell pairs have identical distances. Cell pairs with distances greater than 750µm were all measured with the same electrode bundle that had approximate electrode spacing of 1.5mm, and these distances were all taken to be 1.5mm. Regression analysis reveals no relationship between orientation preference difference and covariation strength (F test, P=0.33), but there is a significant relationship between pair distance and covariation strength (F test, P<0.001).
