Figure 8.

Computation of modulation curves for the interarea coherences of the local field potential during passive viewing. A cohgram (A) is computed from the four possible interarea cohgrams. From this averaged cohgram, modulation curves are calculated for the transient (B) and sustained (C) phases. The dashed lines correspond to the 20 and 130 Hz limits used for averaging in the population statistics (Table 1). Note the negative modulation during the sustained phase for S- (C). This set of data is derived from the same sites as in Figure 7.