Biological Motion Perception Task¶
HED Task ID: hedtsk_biological_motion_perception
Also known as: Point-Light Displays, Point-Light Walker Task, PLW
Judgment of human action or identity from sparse point-light displays attached to major joints; indexes recognition of biological motion from kinematic cues alone.
Description¶
Participants view point-light display stimuli, animations created by placing markers on the joints of a person performing actions and capturing only the light points. The resulting stimuli (12-15 dots representing joints) convey complex human actions (walking, running, dancing) from minimal motion cues. Participants may recognize actions, judge coherence (upright vs. inverted), or discriminate biological from scrambled motion. The task measures perception of complex human movement and activates the posterior superior temporal sulcus, a region specialized for biological motion processing.
Inclusion test¶
Procedure |
Participants view point-light displays (dots at major joints) and identify actions, discriminate facing direction, or detect biological motion embedded in noise dots. |
Manipulation |
Display type (intact vs. scrambled vs. inverted); noise dot density; action category; viewpoint angle. |
Measurement |
Accuracy and RT for action identification, direction discrimination, or detection; noise-dot threshold for biological motion detection. |
Variations¶
Variation |
Description |
Justification |
|---|---|---|
Intact Biological Motion |
Standard point-light walkers with coherent body structure. |
Standard point-light walker; canonical biological motion stimulus |
Scrambled Displays |
Dot positions randomized; preserves local motion, disrupts configural structure. |
Spatially scrambled dots preserve local motion but destroy global form; control condition with different percept |
Inverted Displays |
Upside-down presentation; impairs perception, revealing orientation specificity. |
Walker inverted; disrupts configural processing while preserving motion signals |
Reversed (Backward) Motion |
Normal actions played in reverse. |
Temporal reversal disrupts action identity while preserving form |
Action Recognition |
Classify depicted actions (walk, run, jump, throw, kick). |
Participant identifies specific action (running, kicking); classification task beyond detection |
Detection in Noise |
Biological motion figures embedded in scrambled dot noise masks. |
Walker embedded in noise dots; detection task with varying signal-to-noise |
Gender/Identity Discrimination |
Judge walker’s gender or identity from motion cues alone. |
Discrimination of walker gender or identity; different judgment dimension |
Emotion from Body Motion |
Recognize emotional states from body/gait dynamics. |
Emotional state judged from body kinematics; different recognition task |
Partial/Occluded Displays |
Subsets of body points visible. |
Subset of dots visible; tests perceptual completion of biological motion |
Comparison with Mechanical Motion |
Biological vs. rigid/mechanical motion; tests specificity. |
Mechanical motion control alongside biological; category discrimination task |
Facing Direction Discrimination |
Determine whether the walker faces left or right; sensitive to viewpoint processing. |
Ambiguous facing direction judgment; different perceptual task |
Cognitive processes¶
This task engages the following cognitive processes:
Key references¶
{‘authors’: ‘Johansson, G.’, ‘year’: 1973, ‘title’: ‘Visual perception of biological motion and a model for its analysis’, ‘venue’: ‘Perception & Psychophysics’, ‘venue_type’: ‘journal’, ‘journal’: ‘Perception & Psychophysics’, ‘volume’: ‘14’, ‘issue’: ‘2’, ‘pages’: ‘201-211’, ‘doi’: ‘10.3758/bf03212378’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Johansson, G. (1973). Visual perception of biological motion and a model for its analysis. Perception & Psychophysics, 14(2), 201-211.’, ‘url’: ‘https://doi.org/10.3758/bf03212378’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}
{‘authors’: ‘Grossman, E. D., & Blake, R.’, ‘year’: 2002, ‘title’: ‘Brain Areas Active during Visual Perception of Biological Motion’, ‘venue’: ‘Neuron’, ‘venue_type’: ‘journal’, ‘journal’: ‘Neuron’, ‘volume’: ‘35’, ‘issue’: ‘6’, ‘pages’: ‘1167-1175’, ‘doi’: ‘10.1016/s0896-6273(02)00897-8’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Grossman, E. D., & Blake, R. (2002). Brain areas active during visual perception of biological motion. Neuron, 35(6), 1167-1175.’, ‘url’: ‘https://doi.org/10.1016/s0896-6273(02)00897-8’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}
{‘authors’: ‘Blake, R., & Shiffrar, M.’, ‘year’: 2007, ‘title’: ‘Perception of Human Motion’, ‘venue’: ‘Annual Review of Psychology’, ‘venue_type’: ‘journal’, ‘journal’: ‘Annual Review of Psychology’, ‘volume’: ‘58’, ‘issue’: ‘1’, ‘pages’: ‘47-73’, ‘doi’: ‘10.1146/annurev.psych.57.102904.190152’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Blake, R., & Shiffrar, M. (2007). Perception of human motion. Annual Review of Psychology, 58, 47-73.’, ‘url’: ‘https://doi.org/10.1146/annurev.psych.57.102904.190152’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}
Recent references¶
{‘authors’: ‘Pavlova, M. A.’, ‘year’: 2012, ‘title’: ‘Development of Biological Motion Processing in Normalcy and Pathology’, ‘venue’: ‘People Watching’, ‘venue_type’: ‘book_chapter’, ‘journal’: None, ‘volume’: ‘22’, ‘issue’: ‘5’, ‘pages’: ‘179-200’, ‘doi’: ‘10.1093/acprof:oso/9780195393705.003.0011’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Pavlova, M. A. (2012). Biological motion processing as a hallmark of social cognition. Cerebral Cortex, 22(5), 981–995.’, ‘url’: ‘https://doi.org/10.1093/acprof:oso/9780195393705.003.0011’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}
{‘authors’: ‘Thompson, J. C., & Baccus, W.’, ‘year’: 2012, ‘title’: ‘Form and motion make independent contributions to the response to biological motion in occipitotemporal cortex’, ‘venue’: ‘NeuroImage’, ‘venue_type’: ‘journal’, ‘journal’: ‘NeuroImage’, ‘volume’: ‘59’, ‘issue’: ‘1’, ‘pages’: ‘625-634’, ‘doi’: ‘10.1016/j.neuroimage.2011.07.051’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Thompson, J. C., & Baccus, W. (2012). Form and motion make independent contributions to the response to biological motion in occipitotemporal cortex. NeuroImage, 59(1), 625–634.’, ‘url’: ‘https://doi.org/10.1016/j.neuroimage.2011.07.051’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}
{‘authors’: ‘Federici, A., et al.’, ‘year’: 2020, ‘title’: ‘Editorial Board’, ‘venue’: ‘Research in Autism Spectrum Disorders’, ‘venue_type’: ‘journal’, ‘journal’: ‘Research in Autism Spectrum Disorders’, ‘volume’: ‘77’, ‘issue’: None, ‘pages’: ‘101659’, ‘doi’: ‘10.1016/s1750-9467(20)30149-5’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Federici, A., et al. (2020). Biological motion perception in autism: A meta-analysis. Research in Autism Spectrum Disorders, 77, 101610.’, ‘url’: ‘https://doi.org/10.1016/s1750-9467(20)30149-5’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}
{‘authors’: ‘Gilaie-Dotan, S., Kanai, R., Bahrami, B., Rees, G., & Saygin, A. P.’, ‘year’: 2013, ‘title’: ‘Neuroanatomical correlates of biological motion detection’, ‘venue’: ‘Neuropsychologia’, ‘venue_type’: ‘journal’, ‘journal’: ‘Neuropsychologia’, ‘volume’: ‘51’, ‘issue’: ‘3’, ‘pages’: ‘457-463’, ‘doi’: ‘10.1016/j.neuropsychologia.2012.11.027’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Gilaie-Dotan, S., Kanai, R., Bahrami, B., Rees, G., & Saygin, A. P. (2013). Neuroanatomical correlates of biological motion detection. Neuropsychologia, 51(3), 457–463.’, ‘url’: ‘https://doi.org/10.1016/j.neuropsychologia.2012.11.027’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}
{‘authors’: ‘Thurman, S. M., & Lu, H.’, ‘year’: 2016, ‘title’: ‘Revisiting the importance of common body dynamics in human action perception’, ‘venue’: ‘Attention, Perception, & Psychophysics’, ‘venue_type’: ‘journal’, ‘journal’: ‘Attention, Perception, & Psychophysics’, ‘volume’: ‘78’, ‘issue’: None, ‘pages’: ‘2187–2199’, ‘doi’: None, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Thurman, S. M., & Lu, H. (2016). Revisiting the importance of common body dynamics in human action perception. Attention, Perception, & Psychophysics, 78, 2187–2199.’, ‘url’: None, ‘source’: ‘unresolved’, ‘confidence’: ‘none’, ‘verified_on’: ‘2026-04-20’}
{‘authors’: ‘van Boxtel, J. J. A., & Lu, H.’, ‘year’: 2013, ‘title’: ‘A biological motion toolbox for reading, displaying, and manipulating motion capture data in research settings’, ‘venue’: ‘Journal of Vision’, ‘venue_type’: ‘journal’, ‘journal’: ‘Journal of Vision’, ‘volume’: ‘13’, ‘issue’: ‘12’, ‘pages’: ‘7-7’, ‘doi’: ‘10.1167/13.12.7’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘van Boxtel, J. J. A., & Lu, H. (2013). A biological motion toolbox for reading, displaying, and manipulating motion capture data in research settings. Journal of Vision, 13(12), 7.’, ‘url’: ‘https://doi.org/10.1167/13.12.7’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}
{‘authors’: ‘Miller, L. E., & Saygin, A. P.’, ‘year’: 2013, ‘title’: ‘Individual differences in the perception of biological motion: Links to social cognition and motor imagery’, ‘venue’: ‘Cognition’, ‘venue_type’: ‘journal’, ‘journal’: ‘Cognition’, ‘volume’: ‘128’, ‘issue’: ‘2’, ‘pages’: ‘140-148’, ‘doi’: ‘10.1016/j.cognition.2013.03.013’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Miller, L. E., & Saygin, A. P. (2013). Individual differences in the perception of biological motion: Links to social cognition and motor imagery. Cognition, 128(2), 140–148.’, ‘url’: ‘https://doi.org/10.1016/j.cognition.2013.03.013’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}