Licking during forced spout alternation in rats: resetting the pacemaker or disconnecting the motor output?

Experimental Brain Research
N Hernandez-MesaJ Bures

Abstract

Rats trained to alternate between two adjacent drinking spouts (each spout is retracted after a single lick and presented again after the animal has licked at the other spout) emit 2.5 licks instead of the optimum 1 lick per spout presentation. The question whether the pacemaker of licking is reset or continues to run during transition between spouts was addressed in three experiments performed in 10 highly overtrained rats. Videorecording analysis of oro-facial activities showed that the rat's mouth was firmly closed during the 500 ms transition between spouts. EEG was recorded from the region of hypoglossal nucleus with implanted bipolar electrodes during continued licking at one spout and during spout alternation. Averaging (n = 256, 1024 ms) centered around the onset of the first lick at the newly contacted spout showed 2-3 lick related potentials in the post-transitional interval whereas only one such wave occasionally appeared at the end of the pre-transition period. Computer plotted distributions of post-transition licks (timed with respect to the last pre-transition lick) were examined while the horizontal or vertical distance between spouts was increased. Growing spout separation changed the height but not the timing o...Continue Reading

References

Jun 3, 1977·Science·Z WiesenfeldD N Tapper
Jan 1, 1985·Annual Review of Neuroscience·S Grillner, P Wallén
Jul 1, 1986·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·H P MalmoJ A Weijnen
Sep 1, 1986·Journal of the Experimental Analysis of Behavior·G H CollierL W Kaufman
Jan 1, 1985·Experimental Brain Research·N Hernandez-MesaJ Bures
Jan 1, 1984·Brain, Behavior and Evolution·J A WeijnenJ M van Hest
Jan 1, 1980·Progress in Neurobiology·A A Lowe

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Citations

Jul 31, 1990·Neuroscience Letters·Z Mamedov, J Bures
Jan 1, 2014·Multivariate Behavioral Research·John J McArdle, Scott M Hofer

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