Fig. 4: Optogenetic effects on magnocellular neurons.

LED stimulation of CG feedback increased preferred spatial frequencies (SFs, a), reduced preferred grating size in diameter (b), also reduced receptive field (RF) size measured from achromatic m-sequence stimuli (c), and increased surround suppression index values (SSIs, d) consistently across magnocellular neurons in the sample. Gray lines link values without (black circles) and with (blue circles) LED stimulation per magnocellular neuron. Black/blue diamonds in the interior of each plot indicate magnocellular neuronal averages, error bars are SEMs, and blue asterisks indicate significant effects across LED conditions for magnocellular neurons (see Table 1 for statistics).