The Journal of Neuroscience, June 1, 1998, 18(11):4233-4243
Pinna Movements of the Cat during Sound Localization
Luis C.
Populin and
Tom C. T.
Yin
Neuroscience Training Program and Department of Neurophysiology,
University of Wisconsin-Madison, Madison, Wisconsin 53706
We measured the movements of the external ear, or pinna, using the
magnetic search coil technique in cats trained to look at auditory and
visual targets for a food reward. No behavioral contingencies were
placed on pinna movements. Prominent pinna movements accompany eye
movements when the animal orients to either auditory or visual stimuli.
In visual trials the pinna movements are coordinated with eye
movements, suggesting that they are part of the general orientation
response of the animal. In auditory trials the pinna response was
composed of two movements: short- and long-latency components. Whereas
the long-latency component seemed to occur with the eye movement to the
target, the short-latency component was coupled to the onset of the
stimulus. The short-latency component (~25 msec) was highly
asymmetrical, being largest in the pinna ipsilateral to the stimuli. In
one animal it persisted after >105 trials.
Key words:
cat; external ear; pinna movements; sound localization; orientation response; auditory and visual stimuli
Copyright © 1998 Society for Neuroscience 0270-6474/98/18114233-11$05.00/0