Figure 4.

Attention-modulated firing rate in the periods in between auditory stimuli. (A) PSTH (180 trials) of a single neuron during the passive (gray) and attentive (red) task where two identical stimuli (50 ms; 80 dB; 5322 Hz) separated by 150 ms (left) and 300 ms (right) were delivered. Notice that not only the response but also prominent responses in the absence of stimuli (preceding and between stimuli) are up regulated by attention. (B) Example neuron that had no auditory response, but a prominent and slow response after the termination of auditory stimuli during passive trials. This response was silenced during the attentive trials. However, notice that the activity preceding the first auditory stimulus was increased during attention (in red). In both cases (A,B), the raster plots correspond to the attentive trials. In all cases, 150 and 300 ms intervals were given randomly during the same sessions.