Fig. 12.

Schema to illustrate the possible splitting of the sensory pathways within the cortex. Sensory analysis (red) passes through the direct corticocortical connections and the efference copy related analysis (green) passes to the layer 5 output which then innervates the motor system (with a weak message). This layer 5 output, in turn passes another efference copy through the transthalamic pathways to higher cortical areas each of which in its turn may have the capacity to act more directly on the motor apparatus. Abbreviations: FO first order, HO higher order.