October 2020
Volume 20, Issue 11
Open Access
Vision Sciences Society Annual Meeting Abstract  |   October 2020
Form and Motion in Biological Motion Perception: An Event-related Potential Paradigm
Author Affiliations & Notes
  • Shan Zhang
    University of California, San Diego
  • Ayse P. Saygin
    University of California, San Diego
  • Footnotes
    Acknowledgements  Funded by National Science Foundation (NSF): NSF CAREER BCS-1151805
Journal of Vision October 2020, Vol.20, 950. doi:https://doi.org/10.1167/jov.20.11.950
  • Views
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Shan Zhang, Ayse P. Saygin; Form and Motion in Biological Motion Perception: An Event-related Potential Paradigm. Journal of Vision 2020;20(11):950. https://doi.org/10.1167/jov.20.11.950.

      Download citation file:

      © ARVO (1962-2015); The Authors (2016-present)

  • Supplements

Point-light biological motion (PL-BM) is a complex stimulus that comprises interrelated form and motion cues. Despite the inherently dynamic nature of PL-BM, much remains to be understood about the temporal aspects of BM perception. The event-related potential (ERP) technique provides excellent temporal resolution, but typically involves time-locking to overall stimulus onset, which can make it challenging to explore subtler and ongoing aspects of processing, especially for dynamic stimuli. Here, we developed a novel variant of the ERP method, which features applying sparse visual events onto continuously presented, dynamic PL-BM stimuli. Subjects viewed PL-BM stimuli depicting locomotion with black dots corresponding to the joints of a moving body. A brief contrast reversal (i.e., change to white dots) is then applied to individual frames of the stimulus at an average rate of 3/s, with the goal of inducing a feed-forward wave of visual processing without disturbing the continuity of the ongoing motion. Each trial featured either an intact or a spatially scrambled PL-BM animation matched for local motion and motion energy. Evoked responses to the contrast-reversals showed the expected visual ERP componentry and distribution, indicating the feasibility of the approach. Furthermore, the occipital P1 (90-110ms) and parietooccipital N1 (150-170ms) components were enhanced for intact vs. scrambled PLWs. Frame-level analyses showed that while the response to the stimulus onset could dominate evoked potentials to dynamic stimuli, our ERP paradigm provides a promising approach to study the temporal aspects of BM processing by acting as a probe to “catch the visual system in action.” Follow-up experiments using this paradigm will aim to inform how form and motion cues are processed and integrated during biological motion perception.


This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.