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Your search keyword '"Alejo Keuroghlanian"' showing total 2 results
Start Over Author "Alejo Keuroghlanian" Topic biological motion perception
2 results on '"Alejo Keuroghlanian"'

1. Observation of Point-Light-Walker Locomotion Induces Motor Resonance When Explicitly Represented; An EEG Source Analysis Study

Author

Alberto Inuggi, Claudio Campus, Roberta Vastano, Ghislain Saunier, Alejo Keuroghlanian, and Thierry Pozzo

Subjects
event-related potentials (ERPs), biological motion perception, electroencephalography (EEG), motor resonance, embodied cognition, goal-directed action, Psychology, BF1-990
Abstract

Understanding human motion, to infer the goal of others' actions, is thought to involve the observer's motor repertoire. One prominent class of actions, the human locomotion, has been object of several studies, all focused on manipulating the shape of degraded human figures like point-light walker (PLW) stimuli, represented as walking on the spot. Nevertheless, since the main goal of the locomotor function is to displace the whole body from one position to the other, these stimuli might not fully represent a goal-directed action and thus might not be able to induce the same motor resonance mechanism expected when observing a natural locomotion. To explore this hypothesis, we recorded the event-related potentials (ERP) of canonical/scrambled and translating/centered PLWs decoding. We individuated a novel ERP component (N2c) over central electrodes, around 435 ms after stimulus onset, for translating compared to centered PLW, only when the canonical shape was preserved. Consistently with our hypothesis, sources analysis associated this component to the activation of trunk and lower legs primary sensory-motor and supplementary motor areas. These results confirm the role of own motor repertoire in processing human action and suggest that ERP can detect the associated motor resonance only when the human figure is explicitly involved in performing a meaningful action.

Published
2018
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2. Natural Translating Locomotion Modulates Cortical Activity at Action Observation

Author

Thierry Pozzo, Alberto Inuggi, Alejo Keuroghlanian, Stefano Panzeri, Ghislain Saunier, Claudio Campus, Cognition, Action, et Plasticité Sensorimotrice [Dijon - U1093] ( CAPS ), Université de Bourgogne ( UB ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ), Centro di Neurofisiologia traslazionale, Istituto Italiano di Tecnologia, Università di Ferrara, Istituto Italiano di Tecnologia ( IIT ), Department of Robotics, Brain and Cognitive Sciences ( RBCS ), Neural Computation Laboratory, Laboratorio Cognicao Motora, Federal University of Para - Universidade Federal do Para [Belem - Brésil], Unit for Visually Impaired People [Istituto Italiano di Tecnologia, Genova] ( U-VIP ), and CAPES-COFECUB 819-14

Subjects
body shape, brain-areas, Cognitive Neuroscience, biological motion perception, Neuroscience (miscellaneous), translation, Sensory system, Stimulus (physiology), Electroencephalography, 050105 experimental psychology, lcsh:RC321-571, Visual processing, 03 medical and health sciences, Cellular and Molecular Neuroscience, 0302 clinical medicine, Developmental Neuroscience, premotor cortex, medicine, action perception, 0501 psychology and cognitive sciences, EEG, visual-perception, lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry, Motor resonance, Original Research, Physics, Point light, primary motor cortex, medicine.diagnostic_test, 05 social sciences, eeg rhythms, motor resonance, locomotion, [ SDV.NEU ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], Action observation, mu-rhythms, human gait, Neuroscience, 030217 neurology & neurosurgery, Biological motion, event-related desynchronization, logistic-regression
Abstract

International audience; The present study verified if the translational component of locomotion modulated cortical activity recorded at action observation. Previous studies focusing on visual processing of biological motion mainly presented point light walker that were fixed on a spot, thus removing the net translation toward a goal that yet remains a critical feature of locomotor behavior. We hypothesized that if biological motion recognition relies on the transformation of seeing in doing and its expected sensory consequences, a significant effect of translation compared to centered displays on sensorimotor cortical activity is expected. To this aim, we explored whether EEG activity in the theta (4-8 Hz), alpha (8-12 Hz), beta 1 (14-20 Hz) and beta 2 (20-32 Hz) frequency bands exhibited selectivity as participants viewed four types of stimuli: a centered walker, a centered scrambled, a translating walker and a translating scrambled. We found higher theta synchronizations for observed stimulus with familiar shape. Higher power decreases in the beta 1 and beta 2 bands, indicating a stronger motor resonance was elicited by translating compared to centered stimuli. Finally, beta bands modulation in Superior Parietal areas showed that the translational component of locomotion induced greater motor resonance than human shape. Using a Multinomial Logistic Regression classifier we found that Dorsal-Parietal and Inferior-Frontal regions of interest (ROIs), constituting the core of action-observation system, were the only areas capable to discriminate all the four conditions, as reflected by beta activities. Our findings suggest that the embodiment elicited by an observed scenario is strongly mediated by horizontal body displacement.

Published
2017
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