Dear Luis,
I've red it was not a matter of speed, but of acceleration (positive or
negative)
due to the vestibulo-ocular relation : UFOV narrows with acceleration.
Jean-Francois Stein
Movement, Action and Performance Laboratory
Sports Sciences Department
National Institute for Sports
and Physical Education
11, avenue du Tremblay
F-75012 PARIS
Phone : (+33) 01 41 74042 21
Fax : (+33) 1 41 74 45 35
www.insep.fr/Dss/Labmap/index.html
----- Original Message -----
From: "Luis Nunes" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, December 09, 2003 1:33 PM
Subject: Re: [EM_LIST] Speed and Pupil
> Dear Steve:
>
> 1) In several experiments, (published) pupil size increased significantly
> with incresasing cognitive demands derived from secondary mental tasks,
for
> example when (ordinary driving) was compared with (driving + mental task).
>
> 2) We could also observe pupil size increment in conditions where the
> demands imposed by the traffic environment increased suddenly - for
example
> in an emergency braking situation, the pupilllary response is absolutely
> evident and coincident in time with the moment of maximum deceleration -
> when the driver brakes.
>
> 3) With increasing speed, the pupil decreases - this effect is what we did
> not expect, and we can't explain ...
>
>
>
> ----- Original Message -----
> From: "Rogers" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, December 09, 2003 12:57 PM
> Subject: Re: [EM_LIST] Speed and Pupil
>
>
> Dear Luis
>
> I've been studying drivers gaze patterns over the last
> five years and especially in relation to highly
> demanding high speed driving and racing. Your
> findings are quite interesting. However, its not clear
> from your message whether the pupil gets smaller
> with increased task demands or whether they get
> smaller with an increase or decrese in driving speed.
> Can you clarify this?
>
> Best Regards
>
> Steve
>
>
>
>
> > 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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>
> Dr. Steven Rogers
> Centre for Ecological Psychology
> Department of Psychology
> University of Portsmouth
> King Henry Building
> Portsmouth
> PO1 2DY
> Tel: (023) 9284 5128
> email: [log in to unmask]
>
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