Figure 6.

Excitatory input from ALM PT axons is stronger to VM than to MD. A, Left, Schematic summary of injection strategy. B, Merged bright-field and fluorescence image showing site of ALM injection with AAV-FLEX-ChR2-tdTomato (displayed as green) and tracer (red). C, Merged image showing thalamic labeling. D, Higher-magnification views of thalamus, showing labeling of ALM PT axons (left, green) and ALM-projecting (proj.) TC neurons (middle, red) separately, and in a merged image (right). E, Average responses (±SEM; gray lines) recorded in ALM-projecting VM neurons and MD neurons. F, Cell-based group comparison. G, Animal-based group comparison. H, Animal-based ratios. I, Schematic depiction of the cellular connectivity pattern.