Timing of posterior parahippocampal gyrus activity reveals multiple scene processing stages
- Julien Bastin
- Giorgia Committeri
- Philippe Kahane
- Gaspare Galati
- Lorella Minotti
- J-P Lachaux
- Alain Berthoz
DOIAbstract
Posterior parahippocampal gyrus (PPHG) is strongly involved during scene recognition and spatial cognition. How PPHG electrophysiological activity could underlie these functions, and whether they share similar timing mechanisms is unknown. We addressed this question in two intracerebral experiments which revealed that PPHG neural activity dissociated an early stimulus-driven effect (>200 and 600 and <800 ms). Strongest PPHG gamma band (50150 Hz) activities were found early when subjects passively viewed scenes (scene selectivity effect) and lately when they had to estimate the position of an object relative to the environment (allocentric effect). Based on single trial analyses, we were able to predict when patients viewed scenes (compared ...
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