Frequency decomposition of conditional Granger causality was used to show that on execution of a conditioned avoidance reflex, the activity of the ventral hippocampus in the θ range had unidirectional influences on (predicted) the activity of the ventral tegmental area of the midbrain, the amygdala, and (directly and indirectly via the amygdala) the prefrontal cortex. During the period of expectation of the conditioned signal, activity in the prefrontal cortex in the δ range had one-way influences on activity in the ventral tegmental area and the amygdala.
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