Observing Grasping Actions Directed to Emotion-Laden Objects: Effects upon Corticospinal Excitability

ANAELLI A. NOGUEIRA-CAMPOS , GHISLAIN SAUNIER , VALERIA DELLA MAGGIORE , LAURA A. S. DE OLIVEIRA , ERIKA C. RODRIGUES AND CLAUDIA D. VARGAS

FRONTIERS IN HUMAN NEUROSCIENCE

FRONTIERS RES FOUND

Año: 2016 vol. 10 p. 1 - 20

1662-5161

The motor system is recruited whenever one executes an action as well as when oneobserves the same action being executed by others. Although it is well established that emotion modulates the motor system, the effect of observing other individuals acting in an emotional context is particularly elusive. The main aim of this study was to investigate the effect induced by the observation of grasping directed to emotion-laden objectsupon corticospinal excitability (CSE). Participants classified video-clips depicting the right-hand of an actor grasping emotion-laden objects. Twenty video-clips differing in terms of valence but balanced in arousal level were selected. Motor evoked potentials(MEPs) were then recorded from the first dorsal interosseous using transcranial magnetic stimulation (TMS) while the participants observed the selected emotional video-clips.During the video-clip presentation, TMS pulses were randomly applied at one of twodifferent time points of grasping: (1) maximum grip aperture, and (2) object contact time. CSE was higher during the observation of grasping directed to unpleasant objects compared to pleasant ones. These results indicate that when someone observes an action of grasping directed to emotion-laden objects, the effect of the object valence promotes a specific modulation over the motor system.