Fig. 1: Multielectrode array recording sites and stimulus selectivity for each array.

A Anatomical locations of Utah arrays projected on a common MNI template of the brain. Adapted from Bougou, V., Vanhoyland, M., Bertrand, A. et al. Neuronal tuning and population representations of shape and category in human visual cortex. Nat Commun 15, 4608 (2024)¹⁵. MNI coordinates (X, Y, Z) are as follows: A1 (42, −76, −10), A2 (−35, −89, −8), A3 (−41, −83, 9), A4 (−38, −84, −5), and A5 (51, −66,19). The average response latency and d-prime comparing non-scrambled and scrambled images per array are presented separately. Arrays plotted on cortical renderings of individual subjects are provided in Supplementary Fig. S1. B Average z-normalized net MUA responses to non-scrambled and scrambled images for all visually responsive channels. Horizontal bars indicate significance (non-scrambled > scrambled, p < 0.001, one-sided permutation test). Dotted vertical lines mark stimulus onset. Shading represents standard error (N = number of trials per condition x number of responsive MUA). C Combined box, violin, and scatter plot showing the d-prime values (non-scrambled vs scrambled) within the response window for all responsive multiunits per array. Box plots indicate median (middle line), 25th, 75th percentile (box), and box limits ± 1.5 × interquartile range (whiskers). D Combined box and scatter plot showing the z-normalized net responses within the response window to the human body, human face, and object categories for all visually responsive multiunits per array. Box plots indicate median (middle line), 25th, 75th percentile (box). Strong body preference is evident for array 4. E Classifier performance over time for scrambled versus non-scrambled images (AUC) (left) and for multiclass classification among human body, human face, and objects (macro-averaged AUC) (right). Lines and shading represent the mean ± standard error classification AUC from 10 decoding repetitions. Colored horizontal bars indicate above-chance classification compared to random label shuffling (p < 0.001, one-sided permutation test). Vertical dotted lines mark stimulus onset. Times on the x-axis represent the middle of the 100 ms intervals used for classification. Numbers refer to array number.