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EYE-MOVEMENT  December 2003

EYE-MOVEMENT December 2003

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Subject:

Re: Speed and Pupil

From:

Orazio Pellegrino <[log in to unmask]>

Reply-To:

Eye-movement mailing list <[log in to unmask]>

Date:

Wed, 10 Dec 2003 12:56:46 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (130 lines)

Dear Luis,
I would attache a figure related to our problem (from New Zeland Road
Standard), but the EM List didn't permit it.
Furthermore I advise you that this research is quite old.
In our department we are cheking eye movements vs the complexity of road
context. The aim is to find a relationship among speed (or acceleration),
road context, geometry and visula behaviour.
Let me know about your research and if you are interested to that figure,
write to my email ([log in to unmask])

Orazio

----- Original Message -----
From: "Luis Nunes" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, December 09, 2003 1:55 PM
Subject: Re: [EM_LIST] Speed and Pupil


> Dear Orazio:
>
> Could you please explain more precisely how speed leads to increase the
> accomodation lenght of the pupil ? Are you referring to accomodation in
> terms of focussing to a longer distance ? And with respect to visual
angle,
> could you precise what measure for visual angle you are considering when
> referring to the spontaneous vision angle reduction ? - In fact we
designed
> this experiment to check for the possible changes in the useful field of
> view regarding speed. We measured gaze direction and studied the spatial
> gaze distribution. We also included a condition with a simultaneous
> perifheral detection and discrimination task - the spatial gaze
variability
> was reduced for higher speeds, although with no negative consequences in
> terms of peripheral visual impairment ...
>
>
> Luis
>
>
>
> ----- Original Message -----
> From: "Orazio Pellegrino" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, December 09, 2003 12:43 PM
> Subject: Re: [EM_LIST] Speed and Pupil
>
>
> 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
> [log in to unmask]
>
>
>
> ----- 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
> >
> > --
> > EYE-MOVEMENT mailing list ([log in to unmask])
> > N.B. Replies are sent to the list, not the sender
> > To unsubscribe, etc. see
> http://www.jiscmail.ac.uk/files/eye-movement/introduction.html
> > Other queries to list owner at [log in to unmask]
> >
>
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