Similar preferences for downsteps in three regions of the auditory forebrain.

<p>(A) Distributions of phasic response strengths for downsteps, upsteps, and frequency repeats of 34 multiunits in right auditory cortex (RAC). Data from the same multiunit are connected by lines. The diamonds represent mean logarithmic strengths and the whiskers represent standard errors. Asterisks mark significant differences between pairs of tone steps (t-tests, p < 0.01). Phasic response strength was defined as the maximal normalized firing rate (see lower panels in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0186556#pone.0186556.g003" target="_blank">Fig 3</a>). (B) Distributions of phasic response strengths for the three tone steps of 20 multiunits in right medial geniculate body (MGB). (C) Distributions of phasic response strengths for the three tone steps of 36 multiunits in left auditory cortex (LAC). (D) Distributions of phasic response strength for the three tone steps of 28 multiunits in the LAC of a control monkey who was naive to the categorization task and only passively exposed to the tone sequences.