Skip to main content

Muscular effort increases hand-blink reflex magnitude.

Bufacchi, R.J., Ponticelli, S., Novembre, G., Kilintari, M., Guo, Y. and Iannetti, G.D., 2019. Muscular effort increases hand-blink reflex magnitude. Neuroscience Letters, 702, 11 - 14.

Full text available as:

[img]
Preview
PDF
Bufacchi_etal2019_NeurosciLet.pdf - Published Version
Available under License Creative Commons Attribution Non-commercial.

359kB

DOI: 10.1016/j.neulet.2018.11.046

Abstract

Defensive motor responses elicited by sudden environmental stimuli are finely modulated by their behavioural relevance to maximise the organism's survival. One such response, the blink reflex evoked by intense electrical stimulation of the median nerve (Hand-Blink Reflex; HBR), has been extensively used to derive fine-grained maps of defensive peripersonal space. However, as other subcortical reflexes, the HBR might also be modulated by lower-level factors that do not bear direct relevance to the defensive value of blinking, thus posing methodological and interpretive problems. Here, we tested whether HBR magnitude is affected by the muscular effort present when holding the hand in certain postures. We found that HBR magnitude increases with muscular effort, an effect most likely mediated by the increased corticospinal drive. However, we found strong evidence that this effect is substantially smaller than the well-known effect of eye-hand proximity on HBR magnitude. Nonetheless, care should be taken in future experiments to avoid erroneous interpretations of the effects of muscular effort as indicators of behaviour relevance.

Item Type:Article
ISSN:0304-3940
Additional Information:Funding for this research was provided by: European Research Council and Wellcome Trust, UK
Uncontrolled Keywords:Blink reflex ; Defence ; Motor system ; Muscular effort ; Threat ; Adult ; Blinking ; Electric Stimulation ; Female ; Hand ; Humans ; Male ; Median Nerve ; Muscle, Skeletal ; Posture ; Reflex ; Young Adult
Group:Faculty of Science & Technology
ID Code:34615
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:29 Sep 2020 10:30
Last Modified:29 Sep 2020 10:30

Downloads

Downloads per month over past year

More statistics for this item...
Repository Staff Only -