What causes the facing-the-viewer bias?

Look at the point-light walker in the BMLwalker demo. Is the walker facing you or is it facing away from you? Most observers would see the walker facing the viewer – even though the stimulus itself does not contain any information whatsoever as to what the answer to the above question is. The stimulus is completely devoid of any depth cues. A person that consists of only a few small dots with everything else being invisible would generate the very same image when seen from the front as when seen from the back.

Why then do we perceive the walker as facing us rather than facing away? There are a at least two possible answers to that question and our lab is right at the centre of the debate which one is correct. Literally! The divide between the two theories goes right through the lab. Compare Adam Heenan's recent paper in PLoS ONE to the brand new paper by Seamas Weech which appeared today in the Journal of Vision.

The conclusion: Both theories are correct to some degree. One cause for the facing-the-viewer bias, however, seems to be much more prominent than the other. Find out which it is. Here are the references:

Heenan, A., Troje, N. F. (2014) Both physical exercise and progressive muscle relaxation reduce the facing-the-viewer bias in biological motion perception. PLoS ONE.

Weech, S., McAdam, M., Kenny, S., Troje, N. F. (2014) What causes the facing-the-viewer bias in biological motion? Journal of Vision 14(12):1-15

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CSBBCS at Ryerson

Currently, two of our students are attending the annual meeting of the Canadian Society for Brain, Behaviour, and Cognitive Science at Ryerson University in Toronto. For both of them, it is their last conference while at the BioMotion Lab. Adam Heenan will be defending his PhD thesis very shortly and then move to Ottawa General Hospital and do his internship required to become a licensed clinical psychologist. Maddie Baetz-Dougan, who just received the Medal in Biology and Psychology after graduating with the highest marks of all students in her undergraduate program, will be attending Medical School here at Queen's in the fall.

Both their posters are now up on display and Adam and Maddie are happy to present them to you if you happen to be at the CSBBCS meeting. If you don't make it, here are links to the posters:

Heenan, A., Baetz-Dougan, M., Tao, C., Troje, N. F. (2014) Effects of anxiety on the perception of depth-ambiguous biological motion stimuli are mediated by inhibitory ability.

Baetz-Dougan, M., Troje, N. F. (2014) How Does Variable Response Effort Influence Risk-Sensitive Decision Making in Pigeons?

... and I should add: Adam Heenan's first paper just appeared in PLOS One

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The Alexander von Humboldt Foundation

Niko Troje received a Humboldt Research Award. According to the website of the Alexander von Humboldt Foundation “The award is granted in recognition of a researcher's entire achievements to date to academics whose fundamental discoveries, new theories, or insights have had a significant impact on their own discipline and who are expected to continue producing cutting-edge achievements in the future.”

"I am happy and grateful for this recognition. My thanks go to my ingenious colleague Karl Gegenfurtner from the Justus-Liebig University in Giessen, Germany, and all the colleagues who supported the nomination."

The Alexander von Humboldt Foundation is a German funding agency dedicated to international academic exchange. It runs a number of different programs to attract both young and established scientists to Germany – either for limited academic visits, or to stay there for good as a well funded Alexander von Humboldt Professor. The foundation also has a program that supports young German scientists to go abroad and visit former Humboldt fellows for postdoctoral research.

So, if you want to spend time at a German research institution, have a close look at the programs of the Alexander von Humboldt foundation. Likewise, if you are a German researcher who just received a PhD or equivalent degree and you are looking to conduct postdoctoral research in, say, Canada, then you should contact a Humboldt fellow like, say, myself.

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The brain in action: An international graduate school

The BiomotionLab is now part of an International Graduate School which involves 12 Canadian researchers, 12 German researchers, and – most importantly – doctoral students from all contributing laboratories. Researchers and students in Canada come from York, Western, and Queen's. The two German universities involved are the Justus-Liebig University in Giessen, and the Philipps University in Marburg.

The overarching topic is “The Brain in Action”, that is, how the brain generates motor behaviour and how actions are controlled by sensory input. The questions which our students work on range from the study of hand-eye coordination during grasping, the coordination of visual and vestibular information for sensory-motor control of posture and gait, to the control of eye movements in natural environments. Students on either side of the Atlantic will have the opportunity to spend dedicated research time in a partner lab in the respective other country.

A central element of the organizational structure are annual retreats at alternating locations. Last week, the first was held in Wildbad Kreuth, an academic resort in the mountains South of Munich. Against the beautiful scenery of the Bavarian Alps and treated with fantastic weather the meeting was packed with interesting student presentations and seminars given my established researchers in the field. Students could form new networks and plan new collaborations with peers and faculty alike, many of which are likely to play a major role in their career development. The meeting was a great success and we all look forward to the 2015 retreat which will take place in Ontario.

The International Research and Training Group “The Brain in Action” is funded by the NSERC CREATE program on the Canadian side and the German Research Foundation in Germany. More information, including information how to apply to the program, can be found here.

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What is biological motion?

Do you know what “biological motion” is? I am considered an expert on biological motion perception but I am not entirely sure myself where to use the term and where not to use it. No question, biological motion is a super interesting thing. But also a very diverse one. People have used the term for a whole bag of goodies, often without even realizing that the same label may not always refer to the same thing. Its meaning seems to have evolved over time, too. In a chapter that just came out in a wonderful new book, I attempt to provide an overview about the broader phenomenology that falls under the term “biological motion”. A link to an early version of my chapter is here. But you may rather want to get hold of a copy of the book itself. It is entitled “Social Perception” and edited by M. D. Rutherford and V. A. Kuhlmeier. The book provides a comprehensive overview not just about the perception of biological motion (whatever that is), but also about other aspects of social visual perception. A very interesting read that contains contributions from a considerable number of acclaimed experts in the field.
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