The Journal of Neuroscience, January 5, 2005, ():
Orientation Selectivity without Orientation Maps in Visual Cortex of a Highly Visual Mammal
J. Neurosci. Van Hooser et al.
25: 19
Supplemental data
Files in this Data Supplement:
- supplemental material
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Supplemental Figure 1. Retinotopic map and absent orientation map measured with Kalatsky-Stryker imaging paradigm. a) Retinotopic map computed with phase responses to a drifting horizontal bar. The response phases to a downward moving bar has been subtracted from the phases of an upward moving bar, giving double the absolute phase of the bar position in a cycle. Color denotes phase, and intensity shows relative amplitude of modulation of response to the stimulus frequency. Scale bar is 1mm. b) Same as a) but for a vertical bar. c) Significantly different responses for retinotopy stimulation. All pixels are colored if the distribution of phases for each period of the stimulus is significantly different from uniform (p<0.05 Kolmogorov-Smirnov test). Colors indicate a relative phase. Gray pixels are non-significant pixels. White pixels denote areas of high (blood vessels) or low (out of focus) standard deviation and are excluded. About two-thirds of pixels show significant activity. d) Significantly different responses for orientation stimulation. Same coloring as in c) but now in response to a drifting grating with a slowly rotating direction. Few pixels show significant activity.
- supplemental material
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Supplemental Figure 2. Ad-hoc method for removing blood vessel artifacts and regions out of focus. a) Standard deviation across stimuli averaged across six retinotopy stimuli for the same animal as in Figure 2. Pixels with higher standard deviations are lighter and those with lower standard deviations are darker. b) Histogram of average standard deviation across stimuli. Pixels with very low average standard deviations (values less than the left bar) tend to correspond to regions out of focus, and pixels with very high average standard deviations (values greater than the right bar) tend to correspond to large blood vessels. c) Pixels excluded from further analysis shown in white.
