Advertisement

Topics

Case Studies in Neuroscience: The central and somatosensory contributions to finger inter-dependence and coordination: A study of a "deafferented person".

08:00 EDT 10th April 2019 | BioPortfolio

Summary of "Case Studies in Neuroscience: The central and somatosensory contributions to finger inter-dependence and coordination: A study of a "deafferented person"."

We tested finger force interdependence and multi-finger force-stabilizing synergies in a patient with large-fiber peripheral neuropathy ("deafferented person"). The subject performed a range of tasks involving accurate force production with one finger and with four fingers. In one-finger tasks, non-task fingers showed unintentional force production (enslaving) with an atypical pattern: Very large indices for the lateral (index and little) fingers and relatively small indices for the central (middle and ring) fingers. Indices of multi-finger synergies stabilizing total force and of anticipatory synergy adjustments in preparation to quick force pulses were similar to those in age-matched control females. During constant force production, removing visual feedback led to a slow force drift to lower values (by about 25% over 15 s). The results support the idea of a neural origin of enslaving and suggest that the patterns observed in the deafferented person were re-organized based on everyday manipulation tasks. The lack of significant changes in the synergy index shows that synergic control can be organized in the absence of somatosensory feedback. We discuss the control of the hand in deafferented persons within the alpha-model of the equilibrium-point hypothesis and suggest that force drift results from an unintentional drift of the control variables to muscles toward zero values.

Affiliation

Journal Details

This article was published in the following journal.

Name: Journal of neurophysiology
ISSN: 1522-1598
Pages:

Links

DeepDyve research library

PubMed Articles [25465 Associated PubMed Articles listed on BioPortfolio]

Gray Matter Correlates of Finger Gnosis in Children: A VBM Study.

Accumulating evidence relates finger gnosis (also called finger sense or finger gnosia), the ability to identify and individuate fingers, to cognitive processing, particularly numerical cognition. Mul...

Do theta oscillations explain the somatosensory change detection mechanism?

Recent research has indicated that the mismatch negativity (MMN) is elicited in response to a discernible small change of a somatosensory stimulus applied on the hand. However, the neural mechanism fo...

Exploring the concept of iso-perceptual manifold (ipm): a study of finger force matching tasks.

We used force-matching tasks between the two hands to test predictions of the recently introduced scheme of perception based on the concept of iso-perceptual manifold (IPM) in the combined afferent-ef...

Locating primary somatosensory cortex in human brain stimulation studies: Systematic review and meta-analytic evidence.

Transcranial magnetic stimulation (TMS) over human primary somatosensory cortex (S1), unlike over primary motor cortex (M1), does not produce an immediate, objective output. Researchers must therefore...

Axon formation, extension, and navigation: only a neuroscience phenomenon?

Understanding how neurons form, extend, and navigate their finger-like axonal and dendritic processes is crucial for developing therapeutics for the diseased and damaged brain. Although less well appr...

Clinical Trials [5525 Associated Clinical Trials listed on BioPortfolio]

Modern Pain Neuroscience Applied to Chronic Pain in Patients With Chronic Whiplash Associated Disorders

Modern pain neuroscience has advanced our understanding of chronic whiplash associated disorders (WAD). Previous studies have shown the importance of central sensitization, characterized b...

Functional Organization of Somatosensory Responses in the Secondary Somatosensitive Area and Insula

The implication of the second somatosensory area (SII) and the insular cortex in the processing of somatosensory inputs is now well established. However the functional anatomy of these are...

Pain Processing and Pain Neuroscience Education in Children With Chronic Abdominal Pain

The primary scientific objective of the study entails examining whether altered endogenous pain inhibition is present in children with functional abdominal pain (FAP) and irritable bowel s...

Using Electroencephalography (EEG) and Transcranial Current Stimulation (tCS) to Study and Modulate Cognition Study

Inter-individual variability in responsiveness to interventions poses great challenges for translational neuroscience, and health care in general. Here, we sought to examine the potential ...

Effects of Kinesio Taping in Patients With Somatosensory Tinnitus

There is no specific treatment that can cure somatosensory tinnitus and usually conservative physical therapy modalities are used in the literature. The aim of the study is to investigate ...

Medical and Biotech [MESH] Definitions

Studies designed to examine associations, commonly, hypothesized causal relations. They are usually concerned with identifying or measuring the effects of risk factors or exposures. The common types of analytic study are CASE-CONTROL STUDIES; COHORT STUDIES; and CROSS-SECTIONAL STUDIES.

A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.

The recorded electrical responses from nerve, muscle, SENSORY RECEPTOR, or area of the CENTRAL NERVOUS SYSTEM following stimulation. They range from less than a microvolt to several microvolts. The evoked potential can be auditory (EVOKED POTENTIALS, AUDITORY), somatosensory (EVOKED POTENTIALS, SOMATOSENSORY), visual (EVOKED POTENTIALS, VISUAL), or motor (EVOKED POTENTIALS, MOTOR), or other modalities that have been reported. Often used synonymously to event-related potentials which are associated with higher level cognitive processes.

Area of the parietal lobe concerned with receiving general sensations. It lies posterior to the central sulcus.

Descriptions and evaluations of specific health care organizations.

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Searches Linking to this Article