title: The influence of implicit hand-based representations on mental arithmetic.
abstract: Recently, a strong functional relationship between finger counting and number processing has been suggested. It has been argued that bodily experiences such as finger counting may influence the structure of the basic mental representations of numbers even in adults. However, to date it remains unclear whether the structure of finger counting systems also influences educated adults' performance in mental arithmetic. In the present study, we pursued this question by examining finger-based sub-base-five effects in an addition production task. With the standard effect of a carry operation (i.e., base-10 crossing) being replicated, we observed an additional sub-base-five effect such that crossing a sub-base-five boundary led to a relative response time increase. For the case of mental arithmetic sub-base-five effects have previously been reported only in children. However, it remains unclear whether finger-based numerical effects in mental arithmetic reflect an important but transitory step in the development of arithmetical skills. The current findings suggest that even in adults embodied representations such as finger counting patterns modulate arithmetic performance. Thus, they support the general idea that even seemingly abstract cognition in adults may at least partly be rooted in our bodily experiences.
authors.affiliation: Section Neuropsychology, Department of Neurology, University Hospital, RWTH Aachen University Aachen, Germany.
authors.forename: Elise
authors.initials: E
authors.lastname: Klein
authors.forename: Korbinian
authors.initials: K
authors.lastname: Moeller
authors.forename: Klaus
authors.initials: K
authors.lastname: Willmes
authors.forename: Hans-Christoph
authors.initials: HC
authors.lastname: Nuerk
authors.forename: Frank
authors.initials: F
authors.lastname: Domahs