Figure 7.

Schematic representation of first-order thalamic inputs to excitatory neurons of primary sensory cortex. Within each layer, line thickness and symbol size represent the percentage of each response class seen in that layer. This figure does not show the location of the synaptic inputs responsible for each response class (i.e., for pyramidal cells with apical dendrites spanning many layers dorsally, the actual laminar location of the synaptic input cannot be specified). Though this figure shows four unique projections originating in thalamus, it is not meant to imply that four distinct classes of cells are responsible for each of these response classes; the precise origins of the inputs responsible for each class of response are currently unknown.