Attention and normalization circuits in macaque V1.

Attention significantly increased the tuning amplitude ( P < 0.05), and it showed a trend towards increasing the tuning baseline ( P = 0.095).

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However, using the same MI types calculated from responses to all bar orientation yielded a trend for a positive correlation between the surround MI – attend away condition and the attention MI – no surround ( r = 0.179, P = 0.068, Spearman rank correlation, data not shown), results somewhat reminiscent of those described previously for MT neurons (Ni et al ., 2012 ), even though the effect in these data was much smaller (and only approaching significance).

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