The LFP layer profile was defined as the mean LFP activity in the 60 msec window around the peak of BF bursting, averaged across both oddball and standard trials.
To determine the layer profile of LFP responses in association with BF bursting, we identified a 60 msec window around the peak of BF bursting response in oddball and standard trials, indicated by the red shaded areas in Figure 4A,B and Figure 4 figure supplement 1.
The amplitude of the scalar projection was then normalized by its peak amplitude (excluding the 5 msec around electrical stimulation to avoid stimulation artifact), which we referred to as normalized similarity index.
Event-related potentials (ERP) measured by scalp EEG and MEG have shown that the visual system classifies a stimulus category rapidly within around 100 msec based on the visual characteristics of the input [35], [36].
For the exemplar electrodes, t-scores from two-tailed t-tests (comparing face>checkerboard) exceeded t>6 (Figure S1B, red), t<−12 and t>14 (Figure S2B, red) around 200 msec from the onset of the static stimuli (uncorrected for multiple comparisons).
TDT thresholds were found to be around 20 msec for the unilateral (17 ± 3 msec) and bilateral (24 ± 4 msec) conditions, and both measures were well within the range of previously reported values (e.g., [ 6- 8, 27- 29]).
When the distance between the exposures is between 50 100 msec, the second shape is accurately identified around 70% of the time, whereas accuracy for the shape seen first lies around 30% (Bachman and Allik, 1976).
At 512 msec, the classification method achieves the best classification accuracy.
The latency of P2p was slower at the right (M = 253.07 msec) than the left (M = 244.00 msec) and middle (M = 245.17 msec) sites.
The latency of N1 was faster at the middle (M = 133.23 msec) than the left (M = 59.19 msec) and right (M = 156.67 msec) sites.
