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Article Dans Une Revue Journal of Cognitive Neuroscience Année : 2007

Number within our hands: Modulation of corticospinal excitability of hand muscles during numerical judgment

Résumé

Developmental and cross-cultural studies show that finger counting represents one of the basic number learning strategies. However, despite the ubiquity of such an embodied strategy, the issue of whether there is a neural link between numbers and fingers in adult, literate individuals remains debated. Here, we used transcranial magnetic stimulation to study changes of excitability of hand muscles of individuals performing a visual parity judgment task, a task not requiring counting, on Arabic numerals from 1 to 9. Although no modulation was observed for the left hand muscles, an increase in amplitude of motor-evoked potentials was found for the right hand muscles. This increase was specific for smaller numbers (1 to 4) as compared to larger numbers (6 to 9). These findings indicate a close relationship between hand/finger and numerical representations.
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Dates et versions

hal-00194026 , version 1 (05-12-2007)

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Marc Sato, Luigi Cattaneo, Giacomo Rizzolatti, Vittorio Gallese. Number within our hands: Modulation of corticospinal excitability of hand muscles during numerical judgment. Journal of Cognitive Neuroscience, 2007, 19 (4), pp.684-93. ⟨10.1162/jocn.2007.19.4.684⟩. ⟨hal-00194026⟩
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