Abstract
When an object is repeatedly grasped and lifted, the balance between grip force (normal to the object’s surface) and lift force (tangential to the object’s surface) is programmed according to the mechanical object features within a few lifts. Information related to the mechanical object properties is easily transferred in between both hands, and the cerebellum may play an essential role for the integration and generalization of this information. Recently, we have shown that the transfer of weight-related information in between both hands is impaired in cerebellar degeneration (Nowak et al., Neuropsychologia, 43:20–27, 2005). Here, we investigated the role of the cerebellum for the inter-manual transfer of friction-related information. Healthy subjects and patients with either focal or generalized cerebellar disorders first repeatedly lifted an object with one hand followed by a series of lifts of the same object with the opposite hand. The experiments were performed with the object’s grip surfaces covered with either silk or sandpaper. Patients and healthy subjects scaled grip force differentially to surface friction within a few lifts. However, the ability to transfer friction-related information from one hand to the other was disturbed in cerebellar patients. We interpret these data within the recent concept that the cerebellum is essential for the rapid integration and generalization of mechanical object features in between both hemispheres when handling objects in the environment.
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Notes
We interpret predictive force control within the theoretical framework of internal models being well aware that several theories exist. We have discussed the different theories of internal models within the context of human grip force control earlier in this journal [14]. Nevertheless, we wish to point out that the details of predictive force control have been known and well described long before the concepts of internal models have been developed.
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Acknowledgment
This research was supported by a grant of the Felgenhauer-Stiftung der Deutschen Gesellschaft für Neurologie (DGN) to Dennis A. Nowak.
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Nowak, D.A., Hufnagel, A., Ameli, M. et al. Interhemispheric Transfer of Predictive Force Control During Grasping in Cerebellar Disorders. Cerebellum 8, 108–115 (2009). https://doi.org/10.1007/s12311-008-0081-5
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DOI: https://doi.org/10.1007/s12311-008-0081-5