Journal
HEARING RESEARCH
Volume 244, Issue 1-2, Pages 35-44Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.heares.2008.07.001
Keywords
Midbrain tectum; Inferior colliculus; Superior colliculus; Periaqueductal gray
Funding
- NIH [DC-03948]
- UNC Medical Alumni Association Endowment Fund
- MCyT [BF12000-1358, BFU2004-05909]
- JCyL [SA079/01, SA007C05]
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The newly-discovered tectal longitudinal column (TLC) spans the paramedian region of the mammalian tectum. It has connections with several nuclei of the auditory system. In this report, we provide the first detailed description of the responses of TLC neurons to auditory stimuli, including monaural and binaural tones and amplitude modulated tones. For comparison, responses in the inferior colliculus (IC) were also recorded. Neurons in the TLC were sensitive to similar ranges of frequency as IC neurons, could have comparably low thresholds, and showed primarily excitatory responses to stimulation of the contralateral ear with either phasic or sustained response patterns. Differences of TLC compared to IC neurons included broader frequency tuning, higher average threshold, longer response latencies, little synchronization or rate tuning to amplitude modulation frequency and a smaller degree of inhibition evoked by stimulation of the ipsilateral ear. These features of TLC neurons suggest a role for the TLC in descending auditory pathways. (C) 2008 Elsevier B.V. All rights reserved.
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