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J Neurophysiol 84: 1790-1799, 2000;
0022-3077/00 $5.00
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The Journal of Neurophysiology Vol. 84 No. 4 October 2000, pp. 1790-1799
Copyright ©2000 by the American Physiological Society

Duration Tuning in the Mouse Auditory Midbrain

Antje Brand,1,2 Reas Urban,1 and Benedikt Grothe1,2

 1Zoologisches Institut, Universität München, 80333 Munich; and  2Max-Planck-Institute of Neurobiology, 82152 Martinsried, Germany

Brand, Antje, Reas Urban, and Benedikt Grothe. Duration Tuning in the Mouse Auditory Midbrain. J. Neurophysiol. 84: 1790-1799, 2000. Temporal cues, including sound duration, are important for sound identification. Neurons tuned to the duration of pure tones were first discovered in the auditory system of frogs and bats and were discussed as specific adaptations in these animals. More recently duration sensitivity has also been described in the chinchilla midbrain and the cat auditory cortex, indicating that it might be a more general phenomenon than previously thought. However, it is unclear whether duration tuning in mammals is robust in face of changes of stimulus parameters other than duration. Using extracellular single-cell recordings in the mouse inferior colliculus, we found 55% of cells to be sensitive to stimulus duration showing long-pass, short-pass, or band-pass filter characteristics. For most neurons, a change in some other stimulus parameter, (e.g., intensity, frequency, binaural conditions, or using noise instead of pure tones) altered and sometimes abolished duration-tuning characteristics. Thus in many neurons duration tuning is interdependent with other stimulus parameters and, hence, might be context dependent. A small number of inferior colliculus neurons, in particular band-pass neurons, exhibited stable filter characteristics and could therefore be referred to as "duration selective." These findings support the idea that duration tuning is a general phenomenon in the mammalian auditory system.




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