Turning visual shapes into sounds: early stages of reading acquisition revealed in the ventral occipitotemporal cortex

Perrone-Bertolotti, M; Vidal, JR; De Palma, L; Hamame, CM; Ossandón T.; Kahane, P; Minotti, L; Bertrand O.; Lachaux, JP


he exact role of the left ventral occipitotemporal cortex (VOTC) during the initial stages of reading acquisition is a hotly debated issue, especially regarding the comparative effect of learning on early stimulus-dependent vs. later task-dependent processes. We show that this controversy can be solved with high-temporal resolution intracerebral EEG recordings of the VOTC. We measured High-Frequency Activity (50-150 Hz) as a proxy of population-level spiking activity while participants learned Japanese Katakana symbols, and found that learning primarily affects top-down/task-dependent neural processing, after a few minutes only. In contrast, adaptation of early bottom-up/stimulus-dependent processing takes several days to adapt and provides the basis for fluent reading. Such evidence that two consecutive stages of neural processing, stimulus- and task-dependent are differentially affected by learning, can reconcile seemingly opposite hypotheses on the role of the VOTC during reading acquisition.

Más información

Título de la Revista: NEUROIMAGE
Volumen: 15
Número: 90
Editorial: Science Direct
Fecha de publicación: 2014
Página de inicio: 298
Página final: 307
Notas: ISI