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The effect of motion in the body and face patch systems of macaques

Anna Bognár, Rajani Raman, Nick Taubert, Yordanka Zafirova, Beatrice De Gelder, Martin A Giese, Rufin Vogels

Date / Location: Monday, 11 July 2022 / S03-488
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Aims: Visual information from body movements and facial expressions are essential elements of non-verbal social communication and action recognition. To understand the neural substrate underlying the visual processing of dynamic monkey bodies (DB) and dynamic monkey faces (DF) we conducted fMRI studies in two macaques. Methods & Results: First, 1 s long videos of DB, DF, dynamic artificial objects (DO) and phase scrambled (P) versions of these videos were presented on a dynamic white noise background during passive fixation. Nine body patches were localized along and ventral to the STS with the contrast [(DB > PB) & (DB > DF) & (DB > DO)]. Using the contrast [(DF > PF) & (DF > DO)] we localized 9 face patches in both animals. In a follow-up scan session, we presented the original movies and 2 static images from each movie for 500 ms in a random order, using a block design. Comparing the percent signal change in the previously defined 9 body patches, we found a higher activation for dynamic than static stimuli and a preserved category selectivity for the static stimuli. When comparing the activations in the 9 face patches, the category selectivity was preserved for the static stimuli, whereas the activation for dynamic and static stimuli was similar. Conclusion: These results suggest that movements have a stronger effect on the body patch system. To understand how the shape and motion information is coded in dynamic body patches single-unit recordings are ongoing (Raman et al FENS 2022).

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