try emailing the pupil list
Peter
P.A.Howarth, Ph.D.
Visual Ergonomics Research Group (VISERG)
Department of Human Sciences
Loughborough University, LE11 3TU
England
http://www.lboro.ac.uk/departments/hu/groupd/viserg/viserg1.htm
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----- Original Message -----
From: "Luis Nunes" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, December 09, 2003 11:09 AM
Subject: [EM_LIST] Speed and Pupil
Dear colleagues
In several experiments carried on with participants that drove an
instrumented vehicle in open roads we have found systematically a pupil size
increment effect attributable to increased mental workload - (independent
from variations attributable to daylight changes) - and this effect has also
been consistent with subjective effort measures. We have also found,
congruently, momentary pupill size peaks corresponding to particularly
demanding traffic situations like emergency braking, etc.
But in recent experiments focused on speed effects on visual behaviour, we
found a pupil size reduction attributable to driving speed, but we have no
explanation for this. The reanalysis of data prior experiments regarding
speed seems to confirm this effect also.
Has anyone found this effect, or has anyone some idea about a possible
explanation ?
Thanks
Luis Miguel Nunes
Dirección General de Tráfico
c/Josefa Valcárcel 28
28027-Madrid
Tel. +34 91 301 82 38
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