Fig. 5: Anticipatory periodic modulations of ITPC.
From: Anticipatory and evoked visual cortical dynamics of voluntary temporal attention
a The predictable precue-to-T1 period (gray bar in b) contains low frequency (1–6 Hz) periodicity above that expected from 1/f scale-free activity, determined by a linear fit to the power from 35–200 Hz (solid green line) in log-log space and extrapolated to lower frequencies (dashed green line). Data are presented as mean values ± 95% confidence intervals (CI) of fast Fourier transforms (FFT) bootstrapped across n = 20 sessions. * indicates integer frequencies at which power from the 95% CI of bootstrapped FFTs exceeded the 1/f expectation, p < 0.001. b Group mean (n = 10 participants) 20 Hz ITPC time series from all trials fit with a linear plus periodic model (dashed purple line), in which frequency was a free parameter, indicates a dominant modulatory frequency near 2 Hz. Shaded error region shows ±1 SEM, normalized by a 100 ms baseline period before the precue. c Fitted frequencies to individual participant 20 Hz ITPC time series did not show a statistically significant difference across precue conditions (n = 10 participants, repeated measures ANOVA p = 0.734). Data are presented as mean values ± 1 SEM. Source data are provided as a Source Data file.
