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<title>UTas ePrints - Directional motion contrast sensitivity in developmental dyslexia</title>
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<meta content="Directional motion contrast sensitivity in developmental dyslexia" name="eprints.title" />
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<meta content="Motion; Directional sensitivity; Contrast sensitivity; Developmental dyslexia; Subgroups in dyslexia; Visual motion" name="eprints.keywords" />
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The present study compared the perception of visual motion in two dyslexia classification schemes; the Boder (1973) dyseidetic, dysphonetic and mixed subgroups and Williams, Stuart, Castles and McAnally (2003) surface, phonological and mixed subgroups by measuring the contrast sensitivity for drifting gratings at three spatial frequencies (1.0, 4.0 and 8.0 c/deg) and five drift velocities (0.75, 3.0, 6.0, 12.0 and 18.0 cyc/s) in a sample of 32 children with dyslexia and 32 matched normal readers. The findings show that there were no differences in motion direction perception between normal readers and the group with dyslexia when dyslexia was taken as a homogeneous group. Motion direction perception was found to be intact in the dyseidetic and surface dyslexia subgroups and significantly lowered in both mixed dyslexia subgroups. The one inconsistency in the findings was that motion sensitivity was significantly lowered in the Boder (1973) dysphonetic subgroup and intact in the Williams et al. (2003) phonological subgroup. The findings also provide evidence for the presence of a disorder in sequential and temporal order processing that appears to reflect a difficulty in retaining sequences of non-meaningful auditory and visual stimuli in short-term working memory in children with dyslexia.
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<meta content="2006" name="eprints.date" />
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<meta content="Abstract
The present study compared the perception of visual motion in two dyslexia classification schemes; the Boder (1973) dyseidetic, dysphonetic and mixed subgroups and Williams, Stuart, Castles and McAnally (2003) surface, phonological and mixed subgroups by measuring the contrast sensitivity for drifting gratings at three spatial frequencies (1.0, 4.0 and 8.0 c/deg) and five drift velocities (0.75, 3.0, 6.0, 12.0 and 18.0 cyc/s) in a sample of 32 children with dyslexia and 32 matched normal readers. The findings show that there were no differences in motion direction perception between normal readers and the group with dyslexia when dyslexia was taken as a homogeneous group. Motion direction perception was found to be intact in the dyseidetic and surface dyslexia subgroups and significantly lowered in both mixed dyslexia subgroups. The one inconsistency in the findings was that motion sensitivity was significantly lowered in the Boder (1973) dysphonetic subgroup and intact in the Williams et al. (2003) phonological subgroup. The findings also provide evidence for the presence of a disorder in sequential and temporal order processing that appears to reflect a difficulty in retaining sequences of non-meaningful auditory and visual stimuli in short-term working memory in children with dyslexia.
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<h1 class="ep_tm_pagetitle">Directional motion contrast sensitivity in developmental dyslexia</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Slaghuis, Walter</span> and <span class="person_name">Ryan, John F.</span> (2006) <xhtml:em>Directional motion contrast sensitivity in developmental dyslexia.</xhtml:em> Vision Research, 46 (20). pp. 3291-3303. ISSN 0042-6989</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/2401/1/Slaghuis_and_Ryan.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2401/1/Slaghuis_and_Ryan.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />340Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3097" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1016/j.visres.2006.05.009">http://dx.doi.org/10.1016/j.visres.2006.05.009</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Abstract
The present study compared the perception of visual motion in two dyslexia classification schemes; the Boder (1973) dyseidetic, dysphonetic and mixed subgroups and Williams, Stuart, Castles and McAnally (2003) surface, phonological and mixed subgroups by measuring the contrast sensitivity for drifting gratings at three spatial frequencies (1.0, 4.0 and 8.0 c/deg) and five drift velocities (0.75, 3.0, 6.0, 12.0 and 18.0 cyc/s) in a sample of 32 children with dyslexia and 32 matched normal readers. The findings show that there were no differences in motion direction perception between normal readers and the group with dyslexia when dyslexia was taken as a homogeneous group. Motion direction perception was found to be intact in the dyseidetic and surface dyslexia subgroups and significantly lowered in both mixed dyslexia subgroups. The one inconsistency in the findings was that motion sensitivity was significantly lowered in the Boder (1973) dysphonetic subgroup and intact in the Williams et al. (2003) phonological subgroup. The findings also provide evidence for the presence of a disorder in sequential and temporal order processing that appears to reflect a difficulty in retaining sequences of non-meaningful auditory and visual stimuli in short-term working memory in children with dyslexia.
</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">The definitive version is available at http://www.sciencedirect.com
</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Motion; Directional sensitivity; Contrast sensitivity; Developmental dyslexia; Subgroups in dyslexia; Visual motion</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/380101.html">380000 Behavioural and Cognitive Sciences > 380100 Psychology > 380101 Sensory Processes, Perception and Performance</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2401</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Walter L. Slaghuis</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">07 Nov 2007 13:50</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2401;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=2401">item control page</a></p>
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