<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2900.3132" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The following article is now available
at: <BR></FONT><FONT face=Arial size=2><A
href="http://www.cs.stir.ac.uk/~vcu/papers/CutSmyEvdPer.pdf">http://www.cs.stir.ac.uk/~vcu/papers/CutSmyEvdPer.pdf</A></FONT></DIV>
<DIV><FONT face=Arial size=2><BR>Cutsuridis, V, Smyrnis, N, Evdokimidis, I,
Perantonis, S. (2007)<BR>A Neural Model of Decision Making by the
Superior</FONT></DIV>
<DIV><FONT face=Arial size=2>Colliculus in an Antisaccade Task</FONT></DIV>
<DIV><FONT face=Arial size=2>Neural Networks, 20(6):
690-704<BR> <BR>ABSTRACT<BR></FONT><FONT face=Arial size=2>In the
antisaccade paradigm subjects are instructed to perform <BR>eye movements in the
opposite direction from the location of a <BR>visually appearing </FONT><FONT
face=Arial size=2>stimulus while they are fixating on a central <BR>stimulus. A
recent study investigated saccade reaction times <BR>(SRTs) and percentages of
erroneous </FONT><FONT face=Arial size=2>prosaccades (towards <BR>the peripheral
stimulus) of 2006 young men performing visually <BR>guided antisaccades. A
unimodal distribution of SRTs </FONT><FONT face=Arial size=2>(ranging <BR>from
80 to 600 ms) as well as an overall 25% of erroneous <BR>prosaccade responses
was reported in that large sample. In <BR>this article, we </FONT><FONT
face=Arial size=2>present a neural model of saccade initiation <BR>based on
competitive integration of planned and reactive <BR>saccade decision signals in
the intermediate </FONT><FONT face=Arial size=2>layer of the
superior<BR>colliculus. In the model the decision processes grow nonlinearly
<BR>towards a preset criterion level and when they cross it, a </FONT><FONT
face=Arial size=2>movement<BR>is initiated. The resultant model reproduced the
unimodal distributions<BR>of SRTs for correct antisaccades and erroneous
prosaccades as <BR></FONT><FONT face=Arial size=2>well as the variability of
SRTs and the percentage of erroneous <BR>prosaccade responses.</FONT><FONT
face=Arial size=2> <BR></DIV></FONT>
<DIV><FONT face=Arial><FONT size=2></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2>Keywords: </FONT><FONT
face=NimbusRomNo9L-Regu><FONT size=2>Eye movements; Antisaccades; Buildup
neurons; <BR>Burst neurons; Nonlinear accumulator model; Decision making;
<BR>Saccade reaction times; Superior </FONT><FONT
size=2>colliculus</FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></BODY><p>-- </p>
<p>The University of Stirling is a university established in Scotland by
charter at Stirling, FK9 4LA. Privileged/Confidential Information may
be contained in this message. If you are not the addressee indicated
in this message (or responsible for delivery of the message to such
person), you may not disclose, copy or deliver this message to anyone
and any action taken or omitted to be taken in reliance on it, is
prohibited and may be unlawful. In such case, you should destroy this
message and kindly notify the sender by reply email. Please advise
immediately if you or your employer do not consent to Internet email
for messages of this kind.</p>
</HTML>