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Michael , Ramesh - I believe what we see in visual search in "real-world" situations (like looking at a web page) is that people who read left-to-right languages (English in the cases that I'm familiar with) tend to make an initial fixation in the upper left and then move left to right, then top to bottom. Jacob Nielsen produced some "heat maps" of fixation patterns on web pages and showed an "F-shaped" pattern that reflects these tendencies. Of course all this could be a result of web page designers anticipating where people will look first and then designing web pages with the most important information in the upper left. If you tracked some right-to-left language readers searching for information on the same web sites and found a different pattern you might be able to pull these issues apart. Keith Karn On Mar 26, 2008, at 7:18 AM, Michael Crossland wrote: > Dear Ramesh > > I am not aware of any work on exactly this issue, but there are > thought to > be language differences in the retinal area used for fixation in > people who > lose their central vision: people who read left-right languages (like > English) have a tendancy to (counterintuitively) move their eye to the > right > in order to see a target, and those who read right-left languages tend > to > move their eye to the left. There is an abstract by Guez, Le > Gargasson et > al in Vision Research 1995 on this. > > I have often wondered whether reading trains us to make "default" eye > movements: in a visual search task do readers of English tend to move > their > eye right first of all (and would an Arabic reader do the opposite)? > > Best wishes > Michael > > > -- > Michael Crossland, Ph.D. MCOptom FAAO > Research Fellow, Division of Visual Neuroscience, UCL Institute of > Ophthalmology, London, UK > Specialist Optometrist, Moorfields Eye Hospital NHS Foundation Trust, > London, UK > > Mobile: +44 (0)7714 335 707 > [log in to unmask] > www.mikecrossland.com > > > On 26/03/2008, Ramesh Mishra <[log in to unmask]> wrote: >> >> Dear All >> >> I am working on a problem related to scan path analysis while a person >> is conceptualising the "gist" of any scene. My question is , does >> "gist" perception involve language? I mean are we using language to >> think about the "gist" . Or this process is independent of language. >> Suppose I instruct specifically a subject " please conceptualise the >> "gist" of this image in language X or Y ( if he is a bilingual) to >> later speak about it in X or Y? Will the scan path reveal anything >> about the language specific effects on "gist" perception? Kindly >> suggest if you know of any research that has looked into this >> question. >> >> many thanks in advance. >> >> Regards >> >> Ramesh >> >> >> On 3/14/08, Angelo Buizza <[log in to unmask]> wrote: >>> Dear Keith and dear all, eye movements smoothly pursuing non-visual >> targets have been studied and documented in particular in the '70 and >> '80 of >> last century. Dr. de' Sperati already provided a number of >> references. You >> may also consider Gauthier & Hofferer (1976) and Buizza et al. >> (1979), about >> the possibility of pursuing moving sounds provided the acoustic >> information >> is complemented by additional, congruent motion information (e.g. >> proprioceptive or vestibular), and Van der Steen et al. (1983) about >> the >> possibility of pursuing illusory motion created by strobe lighting. >>> Young and Yasui (1975) suggested that SP movements can be produced if >> the available sensory information (regardless of its origin) is >> enough to >> allow the CNS to reconstruct an internal target velocity signal >> (perceptual >> feedback hypothesis, see also Young 1977), but of course this doesn't >> include the case of imagined targets. >>> Personally, I remember an adult subject (male, 30-35 ys old) able to >> produce eye movements that looked very similar to SP movements, and >> lasting >> a few seconds, when pursuing self-imagined targets or the harmonic >> motion of >> a sound. He was the only one to do so in a sample of more than 15 >> sbjs, and >> we didn't further explore this behaviour. >>> I don't know whether anybody systematically studied those phenomena >>> or >> statistics are available about the percentage of subjects able to >> perform >> such movements. And I don't know whether anybody was able to prove >> that the >> features of such movements are the same as those of the visually >> evoked >> pursuit movements, or they actually are a different kind of eye >> movement. >>> Sincerely >>> >>> Angelo Buizza >>> Dept. Computers and Systems >>> University of Pavia >>> via Ferrata 1 >>> I-27100 Pavia - Italy >>> tel. +390382985359, fax +390382985373 >>> >>> >>> ----- Original Message ----- >>> From: Claudio de'Sperati >>> To: [log in to unmask] >>> Sent: Friday, March 14, 2008 9:58 AM >>> Subject: Re: [EM_LIST] smooth pursuit without a target >>> >>> >>> Dear Keith, making smooth pursuit eye movements without a target >>> indeed >> is >>> not impossible, as instead often claimed, although not too common. I >> don't >>> know how freqeutnly this occurs in children, but in adults there are >> studies >>> clearly showing this phenomenon under certain >>> circumstannces.Forexample, we >>> can pursue the reconstructed representation of a stimulus (the >> "percept") >>> rather than the retinal stimulus (e.g., Steinbach 1976). Also, after >>> stimulus offset pursuit continues for a short while (e.g., >>> Whittaker & >>> Eaholtz 1982), and anticipatory smooth eye movements can be >> volitionally >>> controlled (e.g., Barnes et al 1997). We documented sustained (up to >> about >>> 20 seconds) smooth pursuit eye movements during mental >>> extrapolation of >>> motion (de'Sperati and Santandrea 2005). Arousal/attention level >>> seems >> to be >>> a relevant factor, and perhaps children have a different >>> relationship >>> between arousal/attention, saccades and smooth pursuit. >>> All the best >>> _______________________________________________ >>> >>> Claudio de'Sperati, PhD >>> Associate Professor, Università Vita-Salute San Raffaele >>> Via Olgettina 58, 20132 Milano, Italy >>> Phone no. +39 02 2643 4859, Fax no. +39 02 2643 4892 >>> Home page: http://www.unisr.it/docenti/ricerca/desperati/ >>> _______________________________________________ >>> >>> ----- Original Message ----- >>> From: "Ramesh Mishra" <[log in to unmask]> >>> To: <[log in to unmask]> >>> Sent: Friday, March 14, 2008 5:21 AM >>> Subject: Re: [EM_LIST] smooth pursuit without a target >>> >>> >>>> A very good observation indeed. I too have seen so sometimes. >>>> Ramesh Mishra >>>> >>>> >>>> On 3/14/08, Keith_Karn <[log in to unmask]> wrote: >>>>> Dear Eye-movement list members - >>>>> The other day I was watching my 5 year old daughter learn to roll >> her >>>>> eyes. I was surprised by what I saw - not that a 5 year old rolling >> her >>>>> eyes isn't surprise enough. ;-) It appeared that she was marking >>>>> smooth (pursuit-like) eye movements without a target. I've just >>>>> observed a few others trying a similar movement (moving the eyes >> back >>>>> and forth while close to their maximum deviation in the orbit). It >>>>> appears that others can make similar movements. Has this type of >> eye >>>>> movement been previously documented? >>>>> >>>>> Keith Karn >>>>> [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] >>>>> >>>> >>>> >>>> -- >>>> Ramesh Kumar Mishra PhD >>>> Centre for Behavioural and Cognitive Science >>>> University of Allahabad >>>> Allahabad 211002 >>>> India >>>> Email:[log in to unmask] >>>> Ph-91-0532-2460738 ( work) >>>> Mob-91-9451872007 >>>> Fax-91-0532-2460738( work) >>>> Personal page: http://www.cbcs.ac.in/~rkmishra.htm >>>> Home page: www.cbcs.ac.in >>>> >>>> -- >>>> 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] >>> >> >> >> -- >> Ramesh Kumar Mishra PhD >> Centre for Behavioural and Cognitive Science >> University of Allahabad >> Allahabad 211002 >> India >> Email:[log in to unmask] >> Ph-91-0532-2460738 ( work) >> Mob-91-9451872007 >> Fax-91-0532-2460738( work) >> Personal page: http://www.cbcs.ac.in/~rkmishra.htm >> Home page: www.cbcs.ac.in >> >> -- >> 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]