Figure 3: Effect of learning tone-contingent barpress for water on the tonotopic map in A1. Trained rats received water reward for barpresses in the presence of a 6.0 kHz tone. Upper illustrations show tonotopic maps and quantifications of percent of total area (octave frequency bands) for a naïve rat (A, B) and a rat that attained over 90% correct performance (C, D). Note that training greatly increased the area of representation for the frequency band containing the 6.0 kHz tone signal. Lower graph (E) shows evidence of a “memory code” for the acquired behavioral importance of sound. The area of representation of the frequency band containing the 6.0 kHz tone signal increases as a direct function of the level of behavioral importance of the tone, as indexed by the level of correct performance, indicating that the relevance of a sound can be coded by its area of representation in A1. Figure modified from [27].