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SPM  March 2009

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Subject:

Re: Inclusion of Left handers

From:

"MITCHELL R.L.C." <[log in to unmask]>

Reply-To:

MITCHELL R.L.C.

Date:

Tue, 24 Mar 2009 11:20:59 -0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (74 lines)

Hello Gordon

I second what Jonathan advises below.
If any of your attention tasks have any lexical or verbal elements to
them, then this could be doubly important.

All the best
Rachel

*************************************************************
 
Dr. Rachel L. C. Mitchell,
Lecturer in Psychology, Durham University.
Honorary Senior Research Fellow, Institute of Psychiatry, KCL.
Governor, Tees Esk and Wear Valleys NHS Foundation Trust.
 
Correspondence Address:
Dept. of Psychology,
Durham University,
Science Site,
South Road,
Durham,
Co. Durham.
DH1 3LE.
U.K.
 
Phone +44 (0)191 334 3272
Fax +44 (0)191 334 3241
 

-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]]
On Behalf Of Jonathan Peelle
Sent: 24 March 2009 10:58
To: [log in to unmask]
Subject: Re: [SPM] Inclusion of Left handers

Hi Gordon,

You may want to consider having approximately equal numbers of left
and right handed participants in both the ASD and control groups.
This will ensure that any ASD vs. control differences can't easily be
attributed to handedness issues, and would also let you examine
effects of handedness when you analyze the data.  Otherwise I think
you run the risk (real, or in the minds of reviewers) of confounding
handedness and diagnosis, which could cause problems with
interpretation.  Of course you can argue that handedness is not
thought to be related to what you are interested in, but it would
probably be better to just address it with data.

My 2 cents!  Hope it helps.

Jonathan

On Tue, Mar 24, 2009 at 10:31 AM, Waiter, Dr Gordon D.
<[log in to unmask]> wrote:
> We are about to start recruitment for a study of attention in Autism
> Spectrum Disorder (ASD). A large percentage of our potential ASD
> participants are left handed. I appreciate that trying to minimise
variation
> in our sample is desirable but we're not aware that attention is
lateralised
> or would be expected to be, so are there still reasons to limit our
group to
> right handers only, bearing in mind that our control group will be
right
> handed.
>
> Thanks in advance,
>
> Gordon
>
>

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