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A collection of fragments of understanding in the pursuit of deeper questions.

Selectivity in V1 is Extremely Sharp

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The grating at the center of the gratings' matrix here shows the optimal grating for a particular cell (specificity). All the gratings around it represent gratings to which the cell does not respond anymore. And we can see that just by changing the orientation a little bit (vertical axis), keeping the spatial frequency constant, the cell doesn't respond anymore. And the same can be observed in the opposite case (horizontal axis), where we change the frequency keeping the orientation constant.