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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] > > > > -- > 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] > > -- > 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] > -- 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]