Fig 1.
Example signals for different PLV magnitudes.
Sample IFP signals recorded from two different pairs of electrodes (256 Hz sampling rate) with low (0.34) and high (0.90) Phase Locking Value (PLV). As highlighted, the peaks and troughs from the two recording electrodes are well aligned in the high PLV condition (left column), whereas no clear alignment is observed in the low phase locking condition (right column). Electrodes come from the middle temporal gyrus and superior lateral temporal gyrus (left) and medial Parahippocampal gyrus and middle frontal gyrus (right).
Fig 2.
PLV-based category selectivity for different pairs of brain regions.
(A) Brain maps show the location of regions at which at least one electrode was placed for each subject and the strength of PLV-based category selectivity for each pair of brain regions. The numbers beneath each subject indicate the range of PLV-based category selectivity for that subject. (B) Location of analyzed brain regions (those regions that have been recorded in more than one subject [N = 24]).
Fig 3.
Distribution of category selectivity and its behavioral relevance for pairs of brain regions.
(A) An example edge’s behavioral relevance (z-score = 6.4) for a sample subject; Each of the histogram’s data points represents the category selectivity (calculated using Eq. 2) for one randomly selected subset of hit trials (with the same number as the miss trials). The data point shown with a red line indicates the category selectivity computed for the miss trials (N = 309) of the sample subject (subject 6). Obviously, the miss trials’ category selectivity is considerably separated from that of the hit trials selected subsets. (B) Histogram of category selectivity’s behavioral relevance (Eq. 3) across significant and non-significant edges of all subjects with each data point representing the behavioral relevance for each of 715 edges (p < 1e-78, sign test).
Fig 4.
Different brain regions’ contribution to the behavioral dependence of connectivity.
(A) Left and right columns represent connections from the highest and lowest quantile (octile), respectively of behavioral relevance, separated by involvement of each brain lobe. (B) Distribution of connections for each region, categorized by behavioral relevance, with high behavioral relevance nodes in blue and low behavioral relevance nodes in red.
Fig 5.
Behavioral relevance of category selectivity for each brain lobe.
Lighter-colored regions are the regions with no significant p-values (parietal, temporal, and limbic), red indicates the regions with a longer distance for connections with stronger behavioral relevance, and blue in contrast shows a shorter distance for connections with stronger behavioral relevance.