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. 2015 Jul 15;114(3):1652–1676. doi: 10.1152/jn.00108.2015

Fig. 16.

Fig. 16.

Causal information transfer is layer specific. A: partial directed coherence, a measure of information transfer, calculated from local field potential activity, as rats performed the tactile discrimination task, by frequency bands and for specific time periods of the task. Dark red indicates maximum transfer of information, whereas deep blue indicates minimum information transfer. Top: information transfer from neurons in layer IV to neurons in layers V/VI. Bottom: information transfer from neurons in layers V/VI to neurons in layer IV. Although neurons in all layers causally transferred information during the trial (see text for details), neurons in layers V/VI transferred significantly more information to neurons in layer IV than neurons in layer IV transferred to neurons in layers V/VI during all periods of the task (as noted by the overall yellow and red colors of bottom). This information transfer from neurons in layers V/VI to neurons in layer IV peaked during the animal behavioral response period and was more intense in the gamma band. B, top: amount of information transferred between neurons in layer IV and neurons in layers V/VI during the task (active, the same as depicted in the discrimination period in A) or during passive tactile stimulation in anesthetized conditions (passive). No differences were found in the amount of trials with significant information transfer for any of the 4 frequency bands (see text for details). Bottom: amount of information transferred between neurons in layers V/VI and layer IV during tactile discrimination (active, the same as depicted in the discrimination period in A) or during passive tactile stimulation in anesthetized conditions (passive). During anesthetized conditions (passive), neurons in layers V/VI transferred information to neurons in layer IV in a much smaller number of trials compared with the active state. These results suggest that overall information processing in layers V/VI is more affected by active vs. passive conditions than information processing in layer IV.