Perception, Action & Learning Lab

at Ulsan National Institue of Science and Technology

Research

Imagine a frog that catches a fly using its tongue. To satisfy the needs for food, the frog’s visual system should have been developed to see and follow the trajectories of a fly efficiently. Then, what are the driving forces that make humans see and interact with the world the way we do? What are the computational principles that govern human perception and action? In everyday activities, why are some devices easier to interact with than others?


Within a static object envelope, a pattern motion changes direction at a continuous rate. The resulting static object is perceived to follow a circular object trajectory in visual periphery. Illusions provide clues to perceptual mechanisms. This illusion, which seems to demonstrate the failure of our visual system, is actually the result of optimal inference given noisy sensory signals (Kwon et al., 2015).

In Perception, Action & Learning Lab, we study 1) how the human perceptual system constructs representations of the world from incomplete and noisy sensory signals, 2) how our sensory-motor system coordinates to generate efficient responses, and 3) how we can apply those knowledge to improve the quality of life.

Current research areas include statistical learning in vision, motion perception, visuo-haptic cue integration, and vision of the aging population. To study these problems, we utilize various behavioral and physiological (through collaboration) measurement techniques and computational modeling. Especially, we are interested in building normative computational models that signify the (sub)optimality of human behaviors.

People

Principal Investigator

Oh-Sang

Oh-Sang Kwon

CV

Email: oskwon@unist.ac.kr

Tel: +82-52-217-2735

 

 

Graduate Students

LianaLiana N. Saftari

Email: liana@unist.ac.kr

Liana is a combined M.S.-Ph.D. student. Before joining the lab in Spring 2016, she majored Biomedical Electronic Engineering at Universiti Malaysia Perlis. Her research in our lab focuses on the effect of multisensory integration in motor control to parse object motion from background motion. Other than research, she loves knitting, swimming and watching movies.

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LizaSuraiya J. Liza

Email: jahan@unist.ac.kr

Liza is a Ph.D. student. After receiving her B.S. in Electrical and Electronics Engineering from Ahsanullah University of Science and Technology (AUST) and M.S. in Human Factors Engineering from UNIST with Ian Oakley, she initially started working in the lab as a research assistant in Spring 2017, and then as a Ph.D. student in Fall 2017. Liza’s research in our lab focuses on visual perceptual learning for presbyopia. Besides research, she spends her time sewing, DIY crafting, and cooking.

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SeonggyuSeonggyu Choe

Email: sgchoe@unist.ac.kr

Seonggyu joined the lab in Summer 2016 as an undergraduate research intern. He got his B.S. in Human Factors Engineering (minor: Industrial Design) and entered the combined M.S.-Ph.D. program in Fall 2017. His research currently focuses on time perception and action-induced perception reversal. Outside the lab, he is a very good soccer player and also likes watching movies.

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HyunjunHyun-Jun Jeon

Email: hjjeon@unist.ac.kr

Hyun-Jun is a combined M.S.-Ph.D. student. He joined the lab in Summer 2016 as an undergraduate research intern and started his graduate program in Spring 2018. He received his B.S. in Human Factors Engineering (minor: Computer Science). In our lab, Hyun-Jun is studying visual object tracking with aids from a stochastic process model. When not in the lab, he likes to take photos and play badminton.

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JongminJongmin Moon

Email: jmoon@unist.ac.kr

Jongmin is a combined M.S.-Ph.D. student. He received his B.S. in Human Factors Engineering (minor: System Design and Control Engineering) and entered the graduate program in Fall 2018. His research in our lab focuses on sequential biases in perception and confidence in Bayesian inference, using theoretical predictions from computational models. Outside the lab, he enjoys playing soccer, playing billiards, and hanging out with close friends.

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Current and Former Collaborators

Zygmunt Pizlo: University of California-Irvine, Cognitive Sciences.
Howard Zelaznik: Purdue University, Health & Kinesiology.
George Chiu: Purdue University, Mechanical Engineering.
Jeffrey Shelton: Purdue University, Mechanical Engineering.
Eileen Kowler: Rutgers University, Psychology.
Chia-Chien Wu: Harvard Medical School and Brigham and Women’s Hospital.
David Knill: University of Rochester, Brain & Cognitive Sciences.
Duje Tadin: University of Rochester, Brain & Cognitive Sciences.
Ruyuan Zhang: University of Minesota, Center for Magnetic Resonance Research.
Stanislaw Czyz: North-West University, South Africa, Physical Activity, Sport & Recreation.

Job openings

Post Doctoral Researcher:

Applications are invited for a postdoctoral researcher position. This appointment is for 2 years, and available to start immediately. The monthly salary is 3,000,000 won. Applicants should hold or expect shortly to hold a PhD in psychology, human factors, cognitive science, or related fields, and have (or have a will to develop) strong computational modeling skills. Applicants are expected to have at least one first authored article in internationally respected peer reviewed journal.

Graduate Student:

Students having BA/BS/MS/MA in cognitive science, human factors engineering, neuroscience, computer science, psychology, math, or related fields are encouraged to contact Dr. Kwon for further information.

Publications

Peer-reviewed journal

Integration of position and predictive motion signals in aging vision
Jeon, H.-J., Yun, Y. & Kwon, O.-S. (2020)
Scientific Reports 10:8783

Temporal dynamics of visual attention allocation
Moon, J.**, Choe, S.**, Lee, S. & Kwon, O.-S. (2019)
Scientific Reports 9:3664

Ageing vision and falls: a review
Saftari, L. N. & Kwon, O.-S. (2018)
Journal of Physiological Anthropology 37:11

Recovering stereo vision by squashing bugs in a virtual reality environment
Vedamurthy, I., Knill, D. C., Ding, J, Kwon, O.-S., Bavelier, D. & Levi, D. M. (2016)
Philosophical Transactions of the Royal Society B 371:20150264

A unifying account of visual motion and position perception
Kwon, O.-S., Tadin, D. & Knill, D. C. (2015)
Proceedings of the National Academy of Sciences 112(26):8142-8147
University Press Release (English, Korean)
Covered by CBS sports, Daily Mail, Vox연합뉴스, SBS 뉴스조선일보, 동아사이언스, 베리타스알파, 뉴시스, 울산매일 and 부산일보

Visual uncertainty influences the extent of an especial skill
Czyż, S. H., Kwon O.-S., Marzec, J., Styrkowiec, P. & Breslin, G. (2015)
Human Movement Science 44:143-149

The brain uses adaptive internal models of scene statistics for sensorimotor estimation and planning
Kwon, O.-S. & Knill, D. C. (2013)
Proceedings of the National Academy of Sciences 110(11):E1064-E1073.

Illusory motion of stationary stimuli in visual periphery: evidence for a strong centrifugal prior in motion processing
Zhang, R.**, Kwon, O.-S.** & Tadin, D. (2013)
Journal of Neuroscience 33(10):4415-4423

Especial skill effect across age and performance level: the nature and degree of generalization
Czyż S. H., Breslin G., Kwon, O.-S., Mazur, M., Kobiałka, K. & Pizlo, Z. (2013)
Journal of Motor Behavior 45(2):139-152

Human motor transfer is determined by the scaling of size and accuracy of movement
Kwon, O.-S., Zelaznik, H. N., Chiu, G. C. & Pizlo, Z. (2011)
Journal of Motor Behavior 43(1):15-26

Fitts’s Law and speed/accuracy trade-offs during the sequences of saccades: Implications for strategies of saccadic planning
Wu, C. C., Kwon, O.-S. & Kowler, E. (2010)
Vision Research 50(21):2142–2157

(** equally contributing authors)

In Korean

Psychological Structure of the Hue Modifying Adjectives in Korean
Kim, Y. S., Kim, S. H., Kwon, O.-S., & Yeo, M. S. (2001)
Journal of Korean Society of Color Studies 15(1):21-29

Korean color naming system for textile fashion industry
Lee, M. Y., Kim, Y. I., Kim, Y. S., Pak, H. S., Choi, Y. H., & Kwon, O.-S. (2002)
Journal of Korean Society of Color Studies 16(2):1-24

In review

Early correction in human goal-directed movement
Kwon, O.-S. & Pizlo, Z. (in revision)

In preparation

Sequential effects in velocity estimation of self-generated motion
Kwon, O.-S. & Knill, D. C. (in preparation)

Learning category contingent speed priors for object interception
Kwon, O.-S. & Knill, D. C. (in preparation)

Temporal evolution of motion direction judgments
Kwon, O.-S., Zhang, R. & Tadin, D. (in preparation)

Specificity and transfer in perceptual learning of motion
Zhang, R., Kwon, O.-S. & Tadin, D. (in preparation)

Conference proceedings

Rapid Computation of Time-Optimal, Open-Loop Forearm Movement
Shelton, J. N., Kwon, O.-S. & Chiu, G. (2008)
17th International Federation of Automatic Control World Congress

Single Feedback Model of Human Goal- directed Movement
Kwon, O.-S., Shelton, J. N. & Chiu, G. (2008)
ASME Dynamic Systems and Control Conference

Conference abstracts

Motion perception is biased toward the orientation, not the direction, of the preceding motion
Moon, J. & Kwon, O.-S. (2020)
Vision Sciences Society Annual Meeting

Nature-inspired noise model accounts for a broad range of motion phenomena
Jeon, H.-J.*, Tadin, D. & Kwon, O.-S. (2020)
Vision Sciences Society Annual Meeting

A fat-tailed propagation noise model can explain the jumping percept of a continuously moving object
Jeon, H.-J. & Kwon, O.-S. (2019)
International Conference on Predictive Vision

Additivity of attractive and repulsive sequential effects in motion direction estimation
Moon, J.* & Kwon, O.-S. (2019)
Vision Sciences Society Annual Meeting

Sharpness discrimination as an effective perceptual training task for presbyopia
Liza, S. J., Saftari, L. N., Jeon, H.-J. & Kwon, O.-S. (2019)
Vision Sciences Society Annual Meeting

Duration of a time interval is perceived longer when you know when it ends
Choe, S. & Kwon, O.-S. (2019)
Vision Sciences Society Annual Meeting

Temporal dynamics of visual attention allocation
Choe, S., Moon, J. & Kwon, O.-S. (2018)
Vision Sciences Society Annual Meeting

Atypical visual motion prediction in autism spectrum disorder
Park, W. J.*, Schauder, K., Kwon, O.-S., Bennetto, L. & Tadin, D. (2018)
Vision Sciences Society Meeting

Integration of position and predictive motion signals in older adults
Jeon, H.-J., Yun, Y. & Kwon, O.-S. (2018)
Vision Sciences Society Annual Meeting

Fat-tailed propagation noise model of visual object tracking
Gwak, B.-H., Mohamed, H. & Kwon, O.-S. (2017)
Vision Sciences Society Annual Meeting

Suppressive mechanism in motion perception correlates with postural control ability
Saftari, L. N., Xiong, S. & Kwon, O.-S. (2017)
Vision Sciences Society Annual Meeting

Visuo-haptic cue integration in older adults
Kwon, O.-S., Jaeki, P., Pikul, O., Knill, D. C. & Tadin, D. (2016)
Vision Sciences Society Annual Meeting

Recovering stereo vision by squashing virtual bugs in a VR environment
Levi, D. M.*, Vedamurthy, I., Knill, D., Ding, J., Kwon, O.-S. & Bavelier, D. (2016)
Vision Sciences Society Annual Meeting

Sequential effect on visual classification: The citrus classification paradigm
Yang, T. & Kwon, O.-S. (2016)
Vision Sciences Society Annual Meeting

Temporal evolution of motion direction judgments
Kwon, O.-S.*, Zhang, R. & Tadin, D. (2015)
Vision Sciences Society Annual Meeting

Specificity and transfer in perceptual learning of motion
Zhang, R., Kwon, O.-S. & Tadin, D. (2015)
Vision Sciences Society Annual Meeting

Adaptation to Artificial and Natural Environment in Visual Motion Perception
Kwon, O.-S.* (2015)
International Congress of Physiological Anthropology

An optimal object-tracking model provides a unifying account of motion and position perception
Kwon, O.-S., Tadin, D. & Knill, D. C. (2014)
Computational and Systems Neuroscience (COSYNE)

An optimal object-tracking model provides a unifying account of motion and position perception
Kwon, O.-S.*, Tadin, D. & Knill, D. C. (2014)
Computational and Mathematical Models in Vision (Modvis)

Optimal tracking model accounts for perceptual conflict between motion and position in the curveball illusion
Kwon, O.-S., Tadin, D. & Knill, D. C. (2014)
Vision Sciences Society Annual Meeting

Bayesian observer model of the motion induced position shift
Kwon, O.-S.*, Tadin, D. & Knill, D. C. (2013)
Vision Sciences Society Annual Meeting

Learning category contingent speed priors for object interception
Knill, D. C.* & Kwon, O.-S. (2013)
Vision Sciences Society Annual Meeting

Temporal dependency in estimation of target velocity disappears in self-generated stimuli
Kwon, O.-S. & Knill, D. C. (2012)
Vision Sciences Society Annual Meeting

Humans adaptively use temporal correlations in stimulus history to estimate velocity
Kwon, O.-S. & Knill, D. C. (2011)
Vision Sciences Society Annual Meeting

Extrapolation of target movement is influenced by the preceding velocities rather than by the mean velocity
Kwon, O.-S. & Knill, D. C. (2010)
Vision Sciences Society Annual Meeting

Intermittent feedback model of goal-directed forearm movement
Kwon, O.-S. & Shelton, J. N. (2008)
Vision Sciences Society Annual Meeting

Early Feedback Model of human Goal- directed Movement
Kwon, O.-S., Shelton, J. N. & Pizlo, Z. (2008)
49th Annual Meeting of the Psychonomic Society

Trajectories of Goal-directed Arm Movement
Kwon, O.-S.* & Shelton, J. N. (2007)
The Annual Meeting of the Society for Mathematical Psychology

Multi-resolution model of human motor control
Kwon, O.-S., Pizlo, Z., Zelaznik, H. N. & Chiu, G. (2006)
Vision Sciences Society Annual Meeting

Multi-resolution model of human motor control
Kwon, O.-S.*, Pizlo, Z., Zelaznik, H. N. & Chiu, G. (2005)
The Annual Meeting of the Society for Mathematical Psychology

(Conference talks are marked with *)

Invited talks

Serial dependence in visual tasks. (Dec 13, 2018). Center for Neuroscience Imaging Research Seminar, Institute for Basic Science.

시지각과 통계적 추론. (Oct 16, 2015). Dept. of Psychology Seminar, Pusan National University.

Perception as statistical inference. (Oct 1, 2015). DHE seminar, UNIST.

A unifying model of visual position and motion perception. (April 17, 2015). Neuroscience retreat, University of Rochester.

News

2020

June 23
We are participating the first virtual meeting of Vision Sciences Society (VSS). Hyun-jun gives a talk presentation about his work on the nature-inspired noise model, and Jongmin gives a poster presentation about his work on the sequential effect in motion direction estimation. Come check them out!

May 29
A new paper out! Hyun-Jun’s first paper got published in Scientific Reports. Way to go, Hyun-Jun!

2019

August 27
Seonggyu, Hyun-Jun, Jongmin and Dr. Kwon attended the Korean Southeastern Region Brain Cognitive Imaging Workshop at UNIST. Hyun-Jun and Jongmin made presentations at data blitz and poster sessions.

July 26
Dr. Kwon gave a talk at the Cognitive Neuroscience Symposium at the Center for Neuroscience Imaging Research, Institute for Basic Science. Seonggyu, Hyun-Jun and Jongmin also attended the symposium.

May 17
Liza, Seonggyu, Jongmin and Dr. Kwon are attending the Vision Sciences Society (VSS) 2019 Annual Meeting. Liza and Seonggyu will each make a poster presentation, and Jongmin will make a talk presentation.

March 6
Jongmin and Seonggyu’s paper got published! You may now check their first paper at Scientific Reports. Congratulations!

February 14
Liana, Seonggyu, Hyun-Jun, Jongmin and Dr. Kwon are attending the Korean Society for Cognitive & Biological Psychology. Dr. Kwon will give a talk as a part of the first symposium, and Seonggyu and Jongmin will each make a talk presentation.

2018

December 13
Dr. Kwon was invited to give a talk at the Center for Neuroscience Imaging Research, Institute for Basic Science.

August
Now Jongmin starts his combined M.S.-Ph.D. program at our lab!

May 18
Seonggyu, Hyun-Jun, Jongmin and Dr. Kwon are attending the Vision Sciences Society (VSS) 2018 Annual Meeting. All students will make a poster presentation.

April 23
Liana’s paper got published! You may now check her review paper at Journal of Physiological Anthropology. Congratulations!

February 28
Now Hyun-Jun starts his graduate program at our lab!

February 1
Seonggyu, Hyun-Jun and Dr. Kwon is attending the Korean Society for Cognitive & Biological Psychology. Seonggyu and Hyun-Jun will each make a poster presentation.

January 2
Jongmin joined the lab as an undergraduate intern. Welcome to the lab!