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14-12-2018 | Original Article Open Access

Does gesture strengthen sensorimotor knowledge of objects? The case of the size-weight illusion

Psychological Research
Wim Pouw, Stephanie I. Wassenburg, Autumn B. Hostetter, Bjorn B. de Koning, Fred Paas
Belangrijke opmerkingen
Wim Pouw and Stephanie I. Wassenburg shared first authorship.
Open Data & Pre-registration: Pre-registration form, raw data, and analyses supporting this research report can be retrieved from The Open Science Framework (https://​www.​osf.​io/​9uh6q/​). Due to privacy concerns, the video data cannot be shared publicly.
Note that substantial parts of this manuscript’s content may overlap with the pre-registration form (https://​www.​osf.​io/​9uh6q/​).

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Co-speech gestures have been proposed to strengthen sensorimotor knowledge related to objects’ weight and manipulability. This pre-registered study (https://​www.​osf.​io/​9uh6q/​) was designed to explore how gestures affect memory for sensorimotor information through the application of the visual-haptic size-weight illusion (i.e., objects weigh the same, but are experienced as different in weight). With this paradigm, a discrepancy can be induced between participants’ conscious illusory perception of objects’ weight and their implicit sensorimotor knowledge (i.e., veridical motor coordination). Depending on whether gestures reflect and strengthen either of these types of knowledge, gestures may respectively decrease or increase the magnitude of the size-weight illusion. Participants (N = 159) practiced a problem-solving task with small and large objects that were designed to induce a size-weight illusion, and then explained the task with or without co-speech gesture or completed a control task. Afterwards, participants judged the heaviness of objects from memory and then while holding them. Confirmatory analyses revealed an inverted size-weight illusion based on heaviness judgments from memory and we found gesturing did not affect judgments. However, exploratory analyses showed reliable correlations between participants’ heaviness judgments from memory and (a) the number of gestures produced that simulated actions, and (b) the kinematics of the lifting phases of those gestures. These findings suggest that gestures emerge as sensorimotor imaginings that are governed by the agent’s conscious renderings about the actions they describe, rather than implicit motor routines.

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