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Explicit versus Implicit Processing of Representational Space in Neglect: Dissociations in Accessing the Mental Number Line

¹ University of Padova, ² IRCCS San Camillo, Venezia-Lido, ³ Centro di Riabilitazione di Conselve, Azienda Ospedaliera di Padova

Reprint requests should be sent to Konstantinos Priftis, Dipartimento di Psicologia Generale, via Venezia 8, 35131 Padua, Italy, or via e-mail: konstantinos.priftis@unipd.it.

The present study investigated the effects of left hemispatial neglect on two tasks activating the mental number line (MNL). Six patients with left neglect performed a mental number bisection task and a modified version of the Spatial Numerical Association of Response Codes (SNARC) task. Effects of left neglect were observed in the number bisection task, but not in the SNARC task. We argue that the dissociation between number bisection and SNARC resembles, in the representational space of the MNL, previously reported dissociations on neglect between explicit knowledge (assessed by direct tasks) and implicit knowledge (assessed by indirect tasks).

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