Moving visual percepts had lower reported currents; the color effect was weaker in 9 SEEG patients

We asked whether stimulation current or site position predicted colored or moving visual percepts within patients. We analyzed metadata for 112 visual-effect stimulations in 20 patients from OpenNeuro ds005169 v1.0.0; all stimulations evoked a percept. Within-patient tests included 9 patients per comparison. Colored percepts had a mean reported-current difference of -0.58 log2 units versus non-colored percepts (7 of 9 patients; permutation p = 0.040; exact sign-flip p = 0.070). Moving percepts had lower reported currents than static percepts (-0.77 log2 units; 8 of 9; permutation p = 0.005; Holm-adjusted p = 0.036) and came from more posterior sites (mean y difference -13.3 mm; 8 of 9; Holm-adjusted p = 0.088). Position did not predict color. The current was the clinical effect current, not a measured threshold, and the titration protocol was unavailable. Since no pair was stimulated twice, the analysis cannot separate site effects from current effects. These results describe curator-coded metadata and do not establish stimulation thresholds or generalize beyond this small sample.

stereo-EEG · visual perception · intracranial stimulation · visual prosthesis · reported current · within-patient analysis