Dear Luis Miguel,
higher speed lead to increase the accomodation lenght of the pupil and to a
simultaneous narrowing of the spontaneuos vision angle. I think that this
last fact arouses the reduction of the pupil.
I'm very interesting in your study and if you want contact me I'll be very
happy.
Bye
Orazio Pellegrino
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----- Original Message -----
From: "Luis Nunes" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, December 09, 2003 12:09 PM
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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