Perception of contours defined by integrative motion mechanisms

Perception of contours defined by integrative motion mechanisms. Chen, V. J., Barraza, J. F., & Itti, L. In Proc. Fall Vision Meeting, Oct, 2003.
abstract bibtex

We studied the performance of human subjects for velocity discrimination in six varieties of motion stimuli. Motion was defined by dynamic modulation of luminance, contrast, or color of randomly placed, sparse small dots on a homogeneous background. Importantly, in each and every display used in this study, no dots ever moved relative to the background. For each of the modulation scheme, two varieties of displays are generated: one with static dots and the other with dynamic dots(popping up and disappearing at different locations in each frame of the movie, but never translated), resulting in six varieties of displays. Average luminance stayed constant across regions in the contrast and color modulation displays. Two classes of velocity discrimination thresholds were found. The higher threshold was approximately ten times that of the lower one. Interestingly, the higher threshold was consistently associated with the absence of the perception of well-defined contours in the motion stimuli. Moreover, keeping the average luminance constant throughout the stimuli did not necessarily produce high discrimination thresholds. Contours, real or subjective, appeared to be critical for the estimate of motion parameters such as velocity. To further investigate the link between the perception of contour and the perception of motion, vernier acuity tests were performed on each of the six varieties of displays. Results further supported the existence of motion-based mechanisms that integrate spatio-temporally coherent, but dispersed local changes over large regions that ultimately produce the perception of contours and surfaces.

@inproceedings{ Chen_etal03fvm,
  author = {V. J. Chen and J. F. Barraza and L. Itti},
  title = {Perception of contours defined by integrative motion mechanisms},
  abstract = {We studied the performance of human subjects for velocity
discrimination in six varieties of motion stimuli. Motion was defined
by dynamic modulation of luminance, contrast, or color of randomly
placed, sparse small dots on a homogeneous background. Importantly, in
each and every display used in this study, no dots ever moved relative
to the background. For each of the modulation scheme, two varieties of
displays are generated: one with static dots and the other with
dynamic dots(popping up and disappearing at different locations in
each frame of the movie, but never translated), resulting in six
varieties of displays. Average luminance stayed constant across
regions in the contrast and color modulation displays. Two classes of
velocity discrimination thresholds were found. The higher threshold
was approximately ten times that of the lower one. Interestingly, the
higher threshold was consistently associated with the absence of the
perception of well-defined contours in the motion stimuli. Moreover,
keeping the average luminance constant throughout the stimuli did not
necessarily produce high discrimination thresholds. Contours, real or
subjective, appeared to be critical for the estimate of motion
parameters such as velocity. To further investigate the link between
the perception of contour and the perception of motion, vernier acuity
tests were performed on each of the six varieties of displays. Results
further supported the existence of motion-based mechanisms that
integrate spatio-temporally coherent, but dispersed local changes over
large regions that ultimately produce the perception of contours and
surfaces.},
  booktitle = {Proc. Fall Vision Meeting},
  month = {Oct},
  year = {2003},
  type = {psy},
  review = {abs/conf}
}

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Fall Vision Meeting</i>, Oct 2003.\n\n\n\n\n\n<br class=\"bibbase_paper_content\"/>\n\n<span class=\"bibbase_paper_content\">\n \n \n \n <a href=\"javascript:showBib('Chen_etal03fvm')\"\n class=\"bibbase link\">\n \n\t\n\t\n\t\n BibTeX\n <i class=\"fa fa-caret-down\"></i></a>\n \n \n  \n <a class=\"bibbase_abstract_link bibbase link\"\n href=\"javascript:showAbstract('Chen_etal03fvm')\">\n Abstract\n <i class=\"fa fa-caret-down\"></i></a>\n \n \n \n\n \n \n \n</span>\n\n<div class=\"well well-small bibbase\" id=\"bib_Chen_etal03fvm\"\n style=\"display:none\">\n <pre>@inproceedings{ Chen_etal03fvm,\n author = {V. J. Chen and J. F. Barraza and L. Itti},\n title = {Perception of contours defined by integrative motion mechanisms},\n abstract = {We studied the performance of human subjects for velocity\ndiscrimination in six varieties of motion stimuli. Motion was defined\nby dynamic modulation of luminance, contrast, or color of randomly\nplaced, sparse small dots on a homogeneous background. Importantly, in\neach and every display used in this study, no dots ever moved relative\nto the background. For each of the modulation scheme, two varieties of\ndisplays are generated: one with static dots and the other with\ndynamic dots(popping up and disappearing at different locations in\neach frame of the movie, but never translated), resulting in six\nvarieties of displays. Average luminance stayed constant across\nregions in the contrast and color modulation displays. Two classes of\nvelocity discrimination thresholds were found. The higher threshold\nwas approximately ten times that of the lower one. Interestingly, the\nhigher threshold was consistently associated with the absence of the\nperception of well-defined contours in the motion stimuli. Moreover,\nkeeping the average luminance constant throughout the stimuli did not\nnecessarily produce high discrimination thresholds. Contours, real or\nsubjective, appeared to be critical for the estimate of motion\nparameters such as velocity. To further investigate the link between\nthe perception of contour and the perception of motion, vernier acuity\ntests were performed on each of the six varieties of displays. Results\nfurther supported the existence of motion-based mechanisms that\nintegrate spatio-temporally coherent, but dispersed local changes over\nlarge regions that ultimately produce the perception of contours and\nsurfaces.},\n booktitle = {Proc. Fall Vision Meeting},\n month = {Oct},\n year = {2003},\n type = {psy},\n review = {abs/conf}\n}</pre>\n</div>\n\n\n<div class=\"well well-small bibbase\" id=\"abstract_Chen_etal03fvm\"\n style=\"display:none\">\n We studied the performance of human subjects for velocity discrimination in six varieties of motion stimuli. Motion was defined by dynamic modulation of luminance, contrast, or color of randomly placed, sparse small dots on a homogeneous background. Importantly, in each and every display used in this study, no dots ever moved relative to the background. For each of the modulation scheme, two varieties of displays are generated: one with static dots and the other with dynamic dots(popping up and disappearing at different locations in each frame of the movie, but never translated), resulting in six varieties of displays. Average luminance stayed constant across regions in the contrast and color modulation displays. Two classes of velocity discrimination thresholds were found. The higher threshold was approximately ten times that of the lower one. Interestingly, the higher threshold was consistently associated with the absence of the perception of well-defined contours in the motion stimuli. Moreover, keeping the average luminance constant throughout the stimuli did not necessarily produce high discrimination thresholds. Contours, real or subjective, appeared to be critical for the estimate of motion parameters such as velocity. To further investigate the link between the perception of contour and the perception of motion, vernier acuity tests were performed on each of the six varieties of displays. Results further supported the existence of motion-based mechanisms that integrate spatio-temporally coherent, but dispersed local changes over large regions that ultimately produce the perception of contours and surfaces.\n</div>\n\n\n</div>\n","downloads":0,"bibbaseid":"chen-barraza-itti-perceptionofcontoursdefinedbyintegrativemotionmechanisms-2003","role":"author","year":"2003","type":"psy","title":"Perception of contours defined by integrative motion mechanisms","review":"abs/conf","month":"Oct","key":"Chen_etal03fvm","id":"Chen_etal03fvm","booktitle":"Proc. Fall Vision Meeting","bibtype":"inproceedings","bibtex":"@inproceedings{ Chen_etal03fvm,\n author = {V. J. Chen and J. F. Barraza and L. Itti},\n title = {Perception of contours defined by integrative motion mechanisms},\n abstract = {We studied the performance of human subjects for velocity\ndiscrimination in six varieties of motion stimuli. Motion was defined\nby dynamic modulation of luminance, contrast, or color of randomly\nplaced, sparse small dots on a homogeneous background. Importantly, in\neach and every display used in this study, no dots ever moved relative\nto the background. For each of the modulation scheme, two varieties of\ndisplays are generated: one with static dots and the other with\ndynamic dots(popping up and disappearing at different locations in\neach frame of the movie, but never translated), resulting in six\nvarieties of displays. Average luminance stayed constant across\nregions in the contrast and color modulation displays. Two classes of\nvelocity discrimination thresholds were found. The higher threshold\nwas approximately ten times that of the lower one. Interestingly, the\nhigher threshold was consistently associated with the absence of the\nperception of well-defined contours in the motion stimuli. Moreover,\nkeeping the average luminance constant throughout the stimuli did not\nnecessarily produce high discrimination thresholds. Contours, real or\nsubjective, appeared to be critical for the estimate of motion\nparameters such as velocity. To further investigate the link between\nthe perception of contour and the perception of motion, vernier acuity\ntests were performed on each of the six varieties of displays. Results\nfurther supported the existence of motion-based mechanisms that\nintegrate spatio-temporally coherent, but dispersed local changes over\nlarge regions that ultimately produce the perception of contours and\nsurfaces.},\n booktitle = {Proc. Fall Vision Meeting},\n month = {Oct},\n year = {2003},\n type = {psy},\n review = {abs/conf}\n}","author_short":["Chen, V.<nbsp>J.","Barraza, J.<nbsp>F.","Itti, L."],"author":["Chen, V. J.","Barraza, J. F.","Itti, L."],"abstract":"We studied the performance of human subjects for velocity discrimination in six varieties of motion stimuli. Motion was defined by dynamic modulation of luminance, contrast, or color of randomly placed, sparse small dots on a homogeneous background. Importantly, in each and every display used in this study, no dots ever moved relative to the background. For each of the modulation scheme, two varieties of displays are generated: one with static dots and the other with dynamic dots(popping up and disappearing at different locations in each frame of the movie, but never translated), resulting in six varieties of displays. Average luminance stayed constant across regions in the contrast and color modulation displays. Two classes of velocity discrimination thresholds were found. The higher threshold was approximately ten times that of the lower one. Interestingly, the higher threshold was consistently associated with the absence of the perception of well-defined contours in the motion stimuli. Moreover, keeping the average luminance constant throughout the stimuli did not necessarily produce high discrimination thresholds. Contours, real or subjective, appeared to be critical for the estimate of motion parameters such as velocity. To further investigate the link between the perception of contour and the perception of motion, vernier acuity tests were performed on each of the six varieties of displays. Results further supported the existence of motion-based mechanisms that integrate spatio-temporally coherent, but dispersed local changes over large regions that ultimately produce the perception of contours and surfaces."},"bibtype":"inproceedings","biburl":"http://ilab.usc.edu/publications/src/ilab.bib","downloads":0,"search_terms":["perception","contours","defined","integrative","motion","mechanisms","chen","barraza","itti"],"title":"Perception of contours defined by integrative motion mechanisms","year":2003,"dataSources":["wedBDxEpNXNCLZ2sZ"]}