Journal of Neuroscience, Vol 6, 325-330, Copyright © 1986 by Society for Neuroscience
Contextual control of trigeminal sensorimotor function
KC Berridge and JC Fentress
Simple actions, such as rhythmic tongue protrusions, forelimb facial
strokes, and forelimb flails, are emitted by rats both during taste-
elicited ingestion/aversion and during postprandial grooming. This study
combined peripheral trigeminal deafferentation with a computer- assisted
video analysis of action form to examine the use of cutaneous feedback from
the face in action production. Changes in action form after deafferentation
were found to be context-dependent: Deformations characterized rhythmic
tongue protrusions when emitted in ingestive but not in grooming contexts.
The opposite was true for alterations in forelimb action. Further,
postprandial grooming as a whole was found to comprise distinct
sequentially defined phases. Actions occurring in one highly stereotyped
sequence phase were protected from deafferentation effects, although the
same actions occurring outside of this phase were not. The results suggest
that behavioral context (e.g., grooming versus ingestive set, sequence
phase) can shift the integration of sensory guided and endogenous
mechanisms that pattern simple actions.