Fig. 3.

The responses of LGN neurons evoked by white-noise stimuli. a, Autocorrelation functions of the same LGN neurons as those shown in Figure 2, a and b, evoked by full-field white noise. b, Power spectra of these neurons. c, Summary of the power spectra of 75 LGN neurons in response to full-field white noise, normalized as described in Figure 2c. All the power spectra shown here had positive slopes. Some spectra showed small slopes, because they were less well modulated by white-noise stimuli relative to their noise levels.