Neural dynamics underlying visual and verbal working memory revealed by extensive human intracranial recordings
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1
INSERM U1028 - CNRS UMR5292, France
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2
Translational and Integrative Group in Epilepsy Research (TIGER), France
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3
CNRS UMR 5105, France
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4
Neurology Department, Grenoble University Hospital, France
According to Baddeley (1986) the visuo-spatial sketchpad and the phonological loop deal respectively with visual and verbal information maintenance in working memory. Many studies have independently highlighted the temporal and spatial specificities of these sub-systems in the human brain. However, rarely have they been studied jointly and in depth to understand common and separate neural basis. Here we analyzed the neural dynamics from human intracranial recordings during visual and verbal working memory tasks. We manipulated in both settings the memory load. We focused on three active periods that characterize short-term memory buffering: visual encoding, retention and recall. To assess the level of activity of local neural populations we estimated instantaneous spectral signature in the high-frequency range (50-150Hz) with the Hilbert Transform. We show that effects of information retention can be extracted from single-trial gamma-band responses, selectively within encoding, retention and recall periods. Gamma-band responses could also be modulated by memory load or present a non-specific response to the task. Moreover, our results suggest that many active regions, including temporal, parietal and frontal cortices, overlap in the visual encoding and memory recall periods between visual and verbal working memory. Finally, we show that these regions do not operate independently and form coordinated networks characterized by correlated fluctuations of gamma-band activity. In conclusion, visual and verbal capacities find common ground while simultaneously recruiting specific neural networks during memory maintenance.
Keywords:
gamma band,
Intra-cranial Electrophysiology
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Abstracts
Citation:
Vidal
JR,
Ciumas
C,
Ossandon
T,
Perrone-Bertolotti
M,
Carlos
HM,
Jerbi
K,
Minotti
L,
Kahane
P and
Lachaux
J
(2011). Neural dynamics underlying visual and verbal working memory revealed by extensive human intracranial recordings.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00064
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Received:
15 Nov 2011;
Published Online:
25 Nov 2011.
*
Correspondence:
Dr. Juan R Vidal, INSERM U1028 - CNRS UMR5292, Lyon, France, juanrvidal@gmail.com