tag:blogger.com,1999:blog-2496322937430109609.post7612900449082020867..comments2023-10-19T02:20:50.719-07:00Comments on To Read or not to Read: Unsteady images / blurring /letter spacing effects. Possible reasons.Anonymoushttp://www.blogger.com/profile/15473012725002366768noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-2496322937430109609.post-33489590124500093042013-04-24T02:40:46.555-07:002013-04-24T02:40:46.555-07:00Hi my initial thoughts after a quick read of the p...Hi my initial thoughts after a quick read of the paper above go like this.<br />1. the visual features unit and letter units stage interaction must occur very soon after fixation. and must be occurring during the first 50ms.<br />2.The emails going around last year where it was possible to read with minimal difficulty when the letters in the words were jumbled other than the start finish letter,suggest that there has to be a lexical recognition system which is independent of letter sequence were very significant.<br />3. The very high silent reading speeds with comprehension by people who are saccading every 3 or 4 words needs to be compared with the less than 160 pm typical of dyslexic undergraduates who feel a need to subvocalise or actually vocalise as they read silently there is a clue to mechanism here I think...<br />Sorry I do not think I explained my thinking very well there!Anonymoushttps://www.blogger.com/profile/15473012725002366768noreply@blogger.comtag:blogger.com,1999:blog-2496322937430109609.post-34075007339746289522013-04-24T02:17:35.387-07:002013-04-24T02:17:35.387-07:00Hi Alice. I was not expecting anything other than ...Hi Alice. I was not expecting anything other than to see an individual image. I was actually surprised. Although I had previously 'worried' about why the number of frames per second needed to perceive smooth movement in films was so high. I had decided that the 'system'must be taking several discrete pictures ( edge detection events???) and then computing them together a bit like the visual system crates the illusion of visual space out of lots of fixations. So yes I dud 'see them'. The eye tracker data (binocular) suggests that there is considerable instability during the initial phase of fixation. Instability ion the fixation disparity which implies individual eye movement rather than VOR effects. Some of this movement may be due associated with elasticity issues in the occulomotor system after the ballistic saccade, but that would be more predictable than what I see.<br />I am thinking that this first 50ms was being processed without the integrating effect you refer to. Certainly a more prolonged exposure seemed to prevent the perception.<br />Just read the abstract for the paper you cited. It refers to a 250ms exposure. It would be interesting to look at how people respond with reduced exposures.<br />Just reading http://www.maccs.mq.edu.au/~ssaunder/files/DRC-PsychReview2001.pdf. be back later.Anonymoushttps://www.blogger.com/profile/15473012725002366768noreply@blogger.comtag:blogger.com,1999:blog-2496322937430109609.post-12356991328587770362013-04-22T10:35:29.377-07:002013-04-22T10:35:29.377-07:00Nice observations. I am not sure to have understoo...Nice observations. I am not sure to have understood correctly. Did you actually ‘perceive’ four or five letters from that 50ms, or expected to see them on the bases of you eye-tracker experience? Indeed the image is usually not blurred, nothwithstanding our occular saccades also beacause of neurons in the LIP area of the intraparietal sulcus, which provide a steady retinal representation by combining visual inuts (the Ts) with collicular dicharges about eye movements. So was actually the machine providing you a visual feedback about your muscle tremor, or what? <br />As for a possible cause of surface developmental dislexia, do you know this paper from our group? We provided evidence that VWFA might be the famous orthographic input lexicon described in the Coltheart's reading model.<br />http://www.ncbi.nlm.nih.gov/pubmed?term=18485421<br />What do you think?<br />Alice ProverbioAnonymousnoreply@blogger.com