Online repetitive transcranial magnetic stimulation (TMS) to the parietal operculum disrupts haptic memory for grasping
Articolo
Data di Pubblicazione:
2015
Citazione:
Online repetitive transcranial magnetic stimulation (TMS) to the parietal operculum disrupts haptic memory for grasping / L. Cattaneo, F. Maule, D. Tabarelli, T. Brochier, G. Barchiesi. - In: HUMAN BRAIN MAPPING. - ISSN 1065-9471. - 36:11(2015 Nov), pp. 4262-4271. [10.1002/hbm.22915]
Abstract:
The parietal operculum (OP) contains haptic memory on the geometry of objects that is readily transferrable to the motor cortex but a causal role of OP in memory-guided grasping is only speculative. We explored this issue by using online high-frequency repetitive transcranial magnetic stimulation (rTMS). The experimental task was performed by blindfolded participants acting on objects of variable size. Trials consisted in three phases: haptic exploration of an object, delay, and reach-grasp movement onto the explored object. Motor performance was evaluated by the kinematics of finger aperture. Online rTMS was applied to the left OP region separately in each of the three phases of the task. The results showed that rTMS altered grip aperture only when applied in the delay phase to the OP. In a second experiment a haptic discriminative (match-to-sample) task was carried out on objects similar to those used in the first experiment. Online rTMS was applied to the left OP. No psychophysical effects were induced by rTMS on the detection of explicit haptic object size. We conclude that neural activity in the OP region is necessary for proficient memory-guided haptic grasping. The function of OP seems to be critical while maintaining the haptic memory trace and less so while encoding it or retrieving it.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
affordance; dorsal stream; graspable; object; parietal; premotor; reaching; sensorimotor; somatosensory; tactile; adult; biomechanical phenomena; female; humans; male; memory; motor activity; parietal lobe; psychomotor performance; size perception; touch perception; transcranial magnetic stimulation; young adult
Elenco autori:
L. Cattaneo, F. Maule, D. Tabarelli, T. Brochier, G. Barchiesi
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