Category tuning is independent of best frequency in three regions of the auditory forebrain of trained monkeys.

<p>(A-C) Results for the 34 multiunits in RAC, the 20 multiunits in MGB, and the 36 multiunits in LAC. Category tuning was calculated by dividing the difference of the responses to downsteps and upsteps through the sum of the two responses. Positive values indicate preference for downsteps. (D) In the LAC of the control monkey, category tuning differed between multiunits with low and high best frequencies (below and above 3.5 kHz).