Figure 1: Top-down relationship between frontal and auditory cortices.

(a) A tangential-flattened section of the ferret brain. A, anterior; D, dorsal. (b) An example of a neuron in the ferret frontal cortex that responded vigorously to a target tone during a task in which that stimulus had to be discriminated from several reference sounds; no response was elicited by the same stimulus sequence presented before behavior. PSTH, peristimulus time histogram. (c) When the ferret is engaged in these tasks, the coherence between local field potentials (LFP) recorded simultaneously in A1 and in the frontal cortex (FC) was strongly depressed.