Using Etymotic Research equipment for Physiology (Didier A Depireux )

Subject: Using Etymotic Research equipment for Physiology
From:    Didier A Depireux  <didier(at)ISR.UMD.EDU>
Date:    Mon, 22 Feb 1999 14:41:20 -0500

We do physiological recordings in the Auditory Cortex and IC of ferrets. Our sound delivery set-up consists in a conical speculum, sewed onto the meatus of the ear (after cutting the ear off), with a 19mm Sony earphone attached to it, and a small hole in the side of the speculum to insert a 1/8" B&K 4170 microphone. The 1/8" B&K just died and B&K is asking 4500$ to replace it. So I was thinking that instead, we might get an Etymotic Research system, using an ER-2 sound delivery system, with an ER-7C microphone. Both the ER-2 and the 7C use silicon tubing, between the loudspeaker or the microphone and the ear, with outer diameters of 3mm and .95 mm respectively. I thought we could put the tubes together, make a custom earplug ourselves, and use the ER-2 and the 7C for sound delivery and monitoring. We typically only go up to 16kHz. I was wondering whether anyone uses such a set-up for their recordings, and if so whether they would have warnings/advice they could give us. Anyone who would have a useful comment to make would be welcome too, of course. Thanks in advance, Didier -- Didier A Depireux didier(at) Neural Systems Lab Institute for Systems Research Phone: 301-405-6557 (off) University of Maryland -6596 (lab) College Park MD 20742 USA Fax: 1-301-314-9920

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