Functioning of Circuits Connecting Thalamus and Cortex.

Abstract in brief

• The text explains that glutamatergic pathways in the thalamus and cortex include two types of signals: driver inputs, which carry main information, and modulator inputs, which influence how that information is processed.
• It highlights the existence of different thalamic nuclei, where first-order nuclei relay information directly from subcortical sources like the retina, while higher-order nuclei, such as the pulvinar, transfer information between cortical areas via transthalamic pathways involving layer 5 of the cortex.
• The article suggests that many cortical connections involve indirect thalamic routes that could also act as copies of motor commands (efference copies), indicating a broader and more complex role of the thalamus in cortical communication than previously thought.]