Dear Rachel,
our group has used a sparse data acquision method, where we have inserted
a 4 sec silent interval after each stimulus presentation (with no data
acquisition) to allow for verbal response, immediately followed by data
acquisition (see OVERT language exp 2 in Liegeois et al., Nat Neurosci.
2003 Nov;6(11):1230-7). This means that you are not scanning continuously
and have one scan per response, but this may enable you to analyse the
data on a trial by trial basis if this were useful for your experiment.
This method has two advantages: (i)avoiding motion artefacts related to
speech during data acquisition (ii)allowing you to record responses in
silence and therefore analyse them off line.
As for recording responses, we have recently used a home-made device
whereby the output of the headcoil microphone is connected to a laptop
which records reponses using a widely available software (Adobe Audition).
Again, if you want to analyse the verbal output in a very accurate way-say
for acoustic anaylses-then this is not ideal, and you may need a higher
quality microphone and recording device. It depends on what you need.
Good luck,
Best wishes,
Frederique
> Hello everybody.
>
> Do any of you run studies during which you record verbal responses whilst
> participants are being scanned? We have been triallinng a home-made
> system,
> but the sound quality cis not ideal. Is it now possible to buy off the
> shelf products to record verbal responses? Which companies supply such
> products? If you have any other advice, e.g. about your own experiences
> trying to record verbal responses, then this information would be valuable
> too.
>
> with very best wishes
> Rachel
>
> --
> ******************************************************
> Dr Rachel L.C. Mitchell
> Lecturer in Cognitive Psychology,University of Reading,
> Honorary Research Fellow, Institute of Psychiatry
> Research Psychologist, Berkshire Healthcare NHS Trust
>
> Correspondence Address:
> School of Psychology,
> The University of Reading,
> Whiteknights Road,
> Reading,
> Berkshire.
> RG6 6AL.
>
> Tel: +44 (0)118 378 8523
> Direct Tel: +44 (0)118 378 7530
> Fax: +44 (0)118 378 6715
>
--
Frederique Liegeois, PhD
Lecturer in Cognitive Neuroscience
Developmental Cognitive Neuroscience Unit
Institute of Child Health, UCL
30 Guilford Street
LONDON WC1N 1EH
U.K.
------
phone: 44 (0)20 7905 2728
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