reflex

https://doi.org/10.1351/goldbook.12044
Involuntary reaction in response to a stimulus applied to the periphery following its transmission to the nervous centers in the brain or spinal cord.
Note: Often contraction of a muscle due to a stimulus applied to its proprioceptors.
Source:
PAC, 2015, 87, 841. (IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)) on page 901 [Terms] [Paper]