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Integration and propagation of somatosensory responses in the corticostriatal pathway: an intracellular study in vivo

The striatum is a deep‐brain region that controls sensory‐guided behaviours. It is proposed that this striatal function is achieved by the integration of sensory information arising from the cerebral cortex. By means of in vivo electrophysiological tools, we examine in the rat how natural sensory events are integrated in cortical neurons and subsequently processed in their neuronal targets in the striatum. Although cortical neurons are reliably excited by the sensory stimulus, we found that neurons in the striatum display either no sensory response or a synaptic excitation that is able to produce a functional signal in only half of the neurons. These data show that the propagation of the sensory flow from the cortex to the striatum results in a refinement of external information that could allow the selection of more appropriate behaviours.