Enhancing duration processing with parietal brain stimulation
(2016) Neuropsychologia — Vol. 85, p. 272-277 (2016)
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- Numerosity and duration are thought to share common magnitude-based mechanisms in brain regions including the right parietal and frontal cortices. Numerosity and duration are, however, also different in several intrinsic features. For instance, in a quantification context, numerosity is known for being more automatically accessed than temporal events, and durations are by definition sequential whereas numerosity can be both sequential and simultaneous. Moreover, measures of cerebral activations during numerosity and duration processing have highlighted some divergences in terms of their neuronal correlates. Whether these observed neuronal specificities can be accounted for by differences in automaticity or presentation-mode is however not clear. To address this issue, we used a novel approach based on brain stimulation (transcranial random noise stimulation, tRNS) to the right parietal cortex or the SMA combined with experimental stimuli differing in their level of automaticity (numerosity and duration) and presentation mode (sequential or simultaneous). Compared to a non-stimulation group, performance improved in duration but not in numerosity categorisation following right parietal but not SMA stimulation. These results indicate that the right parietal cortex is critical for duration processing, and suggest that tRNS has a stronger effect on less automatic processes such as duration.
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Dormal, V., Javadi, A.-H., Pesenti, M., Walsh, V., & Cappelletti, M. (2016). Enhancing duration processing with parietal brain stimulation. Neuropsychologia, 85, 272-277. https://doi.org/10.1016/j.neuropsychologia.2016.03.033 (Original work published 2016)