Message Number: FHL13280 | New FHL Archives Search
From: Sukie Crandall
Date: 2011-05-17 17:42:13 UTC
Subject: [ferrethealth] latest abstracts (or just locations for two without abstracts)
To: fhl <>

German situation (without any abstract available):
> 1. Vet Rec. 2011 May 14;168(19):519.
> Increasing numbers of Giardia (but not coccidian) infections in ferrets, 2002 to
> 2010.
> Pantchev N, Gassmann D, Globokar-Vrhovec M.
> Idexx Vet Med Lab, Mörikestrasse 28/3, 71636 Ludwigsburg, Germany.
> PMID: 21571856 [PubMed - in process]

English (again no abstract):
> Vet Rec. 2011 May 14;168(19):518-9.
> Working ferrets: forgotten and neglected?
> Cooper JE.
> Source
> Department of Veterinary Medicine, University of Cambridge, Cambridge CB3 0ES.
> PMID: 21571853 [PubMed - in process]

> J Neurophysiol. 2011 May 11. [Epub ahead of print]
> Binaural sensitivity changes between cortical on and off responses.
> Hartley DE, Dahmen JC, King AJ, Schnupp JW.
> Source
> 1Oxford University.
> Abstract
> Neurons with paired on and off responses have been described in the primary auditory cortex (A1) of anesthetized and awake animals. Previous studies have shown that these responses usually cover different sound frequency ranges, but it is unknown whether other properties, including sensitivity to binaural localization cues, changes between on and off responses. In order to address this question, we measured the sensitivity of A1 neurons in anesthetized ferrets to i) interaural level differences (ILDs) using unmodulated broadband noise with varying ILDs and average binaural levels, and ii) interaural time delays (ITDs) using sinusoidally amplitude-modulated broadband noise with varying envelope ITDs. We also assessed fine structure ITD sensitivity and frequency tuning using pure-tone stimuli. On and off responses to stimuli of ≥100 ms in duration were seen in about 25% of the units recorded whereas, on average, distinct on and off responses in response to shorter stimulus durations were not observed. About a quarter of units with on and off responses were sensitive to ILDs and ITDs in the envelope and/or fine structure of the stimulus. Binaural sensitivity, as well as frequency tuning, changed significantly between the on and off response in 96.6% of cases. A principal components analysis of the ITD response functions suggested a continuous cortical distribution of binaural sensitivity, rather than discrete binaural response classes. Rather than reflecting a release from inhibition without any functional significance, we propose that binaural off responses may be important to cortical encoding of sound-source location.
> PMID: 21562191 [PubMed - as supplied by publisher]

Sukie (not a vet)

Recommended ferret health links:
all ferret topics:

"All hail the procrastinators for they shall rule the world tomorrow."
(2010, Steve Crandall)


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