Fig. 2: High-gamma activity (80–150 Hz) in the human OFC represents the subjective value of food rewards. | Nature Communications

Fig. 2: High-gamma activity (80–150 Hz) in the human OFC represents the subjective value of food rewards.

From: Electrophysiological population dynamics reveal context dependencies during decision making in human frontal cortex

Fig. 2

a Location of OFC electrode contacts mapped onto a standard reference brain (Montreal-Neurological-Institute, or MNI template). We used the toolbox in https://github.com/fahsuanlin/fhlin_toolbox to generate the brain images. We collected data from a total of 166 electrode contacts in the OFC from 20 subjects. b Subjective-value representations across OFC contacts. Here we plot the mean time course (averaged across all OFC contacts) of regression coefficients for the subjective value of the current trial (current SV, in blue) and the subjective value of the previous trial (previous SV, in green). c Subjective-value representations from individual OFC contacts. We plot the t statistic of the current subjective value against that of the previous subjective value separately for each contact. Each data point represents a single contact. For each contact, we select the most significant time point according to the threshold-free-cluster-enhancement (TFCE) statistic, and plot the corresponding t statistic, separately for the current subjective value and previous subjective value. Since the t statistics come from the most significant time points, the data points in the graph are biased away from zero. Individual contacts that significantly represent the current subjective value, previous subjective value, or both are shown in blue, green, and red respectively. Individual contacts that neither represented the current nor the previous subjective value are shown in gray. The pie chart shows the proportions of contacts belonging to each of the categories described above. d Results from two example OFC contacts. Coordinates are in MNI space. We used FSL [Smith, S. M. et al. Advances in functional and structural MR image analysis and implementation as FSL. in NeuroImage 23 (2004)] to generate the brain images. Colored (blue or green) horizontal lines with the * symbol on top or beneath indicate the time points with p < 0.05 (familywise error corrected) using permutation test (one-tailed) with the threshold-free-cluster-enhancement (TFCE) statistic as the test statistic. Error bands represent ±1 standard error of the mean. Source data are provided as a Source Data file.

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