Fig. 3.

LGN-dependent response patterns. Each point is an average of 20–30 randomized runs. A, Spatial-frequency tuning. Cell responses (spikes per second) are plotted against spatial frequency of vertically oriented sinusoidal gratings applied to the entire receptive field. Three curves shown are for (1) active dendrites with spatially organized geniculocortical projection, (2) active dendrites but with spatially scrambled geniculocortical projection, and (3) passive dendrites with spatially organized geniculocortical projection. B, For length summation runs, a vertical bar of optimal width was presented at a range of lengths, centered in the receptive field. An increasing trend can be seen in all three cases (same conditions as in A).