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The Role of Motor System in Mental Rotation: New Insights from Myotonic Dystrophy Type 1

Published online by Cambridge University Press:  11 December 2019

Giorgia Cona
Affiliation:
Department of General Psychology, University of Padova, Padova, Italy Padova Neuroscience Center, Padova, Italy
Arianna Casagrande
Affiliation:
Department of Neuroscience, University of Padova, Padova, Italy
Sabrina Lenzoni
Affiliation:
Department of Neuroscience, University of Padova, Padova, Italy
Elena Pegoraro
Affiliation:
Department of Neuroscience, University of Padova, Padova, Italy
Virginia Bozzoni
Affiliation:
Department of Neuroscience, University of Padova, Padova, Italy
Luca Bello
Affiliation:
Department of Neuroscience, University of Padova, Padova, Italy
Gianni Sorarù
Affiliation:
Department of Neuroscience, University of Padova, Padova, Italy
Annalisa Botta
Affiliation:
Department of Biomedicine and Prevention, Medical Genetics Section, University of Rome Tor Vergata, Rome, Italy
Carlo Semenza
Affiliation:
Padova Neuroscience Center, Padova, Italy Department of Neuroscience, University of Padova, Padova, Italy IRCCS San Camillo Hospital, Venice, Italy
Corresponding
E-mail address:

Abstract

Objective:

This study explored mental rotation (MR) performance in patients with myotonic dystrophy 1 (DM1), an inherited neuromuscular disorder dominated by muscular symptoms, including muscle weakness and myotonia. The aim of the study was twofold: to gain new insights into the neurocognitive mechanisms of MR and to better clarify the cognitive profile of DM1 patients. To address these aims, we used MR tasks involving kinds of stimuli that varied for the extent to which they emphasized motor simulation and activation of body representations (body parts) versus visuospatial imagery (abstract objects). We hypothesized that, if peripheral sensorimotor feedback system plays a pivotal role in modulating MR performance, then DM1 patients would exhibit more difficulties in mentally rotating hand stimuli than abstract objects.

Method:

Twenty-four DM1 patients and twenty-four age- and education-matched control subjects were enrolled in the study and were required to perform two computerized MR tasks involving pictures of hands and abstract objects.

Results:

The analysis of accuracy showed that patients had impaired MR performance when the angular disparities between the stimuli were higher. Notably, as compared to controls, patients showed slower responses when the stimuli were hands, whereas no significant differences when stimuli were objects.

Conclusion:

The findings are coherent with the embodied cognition view, indicating a tight relation between body- and motor-related processes and MR. They suggest that peripheral, muscular, abnormalities in DM1 lead to alterations in manipulation of motor representations, which in turn affect MR, especially when body parts are to mentally rotate.

Type
Regular Research
Copyright
Copyright © INS. Published by Cambridge University Press, 2019

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