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: [email protected]

Tel: +82-52-217-2735

 

 

Graduate Students

LianaLiana N. Saftari

Email: [email protected]

Liana is a combined M.S.-Ph.D. student. Before joining the lab in Spring 2016, she majored in 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: [email protected]

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 Prof. Ian Oakley, she 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: [email protected]

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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Processed with VSCO with au5 presetHyun-Jun Jeon

Email: [email protected]

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: [email protected]

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 effects 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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Changyeong_220629_2Chang Yeong Han

Email: [email protected]

Chang Yeong is an M.S. student in the lab. He received his B.S. in Human Factors Engineering (minor: Environmental Science) and started his graduate program in Spring 2021. His research focuses on temporal integration in the human early visual system. When not in the lab, he loves traveling, playing the piano, and watching movies.
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Ju HyunJu Hyun Yeo

Email: [email protected]

Ju Hyun is an M.S. student in our lab. She got her B.S. in Occupational Therapy from Yonsei University Mirae Campus and started her graduate program in Fall 2022. Ju Hyun is interested in how the mind generates voluntary actions and is currently studying ideomotor theory. Outside the lab, she likes exploring new places, such as cafes and exhibitions, reading books, and taking a walk.

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Current and Former Collaborators

Zygmunt Pizlo: University of California-Irvine, Cognitive Sciences.
Howard Zelaznik: Purdue University, Health and 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 and Cognitive Sciences.
Duje Tadin: University of Rochester, Brain and Cognitive Sciences.
Ruyuan Zhang: Shanghai Jiao Tong University, Shanghai Mental Health Center and Institute of Psychology and Behavioral Science.
Stanislaw Czyz: North-West University, Health Sciences.

Job openings

Post Doctoral Researcher:

Applications are invited for a postdoctoral researcher position. This appointment is for 2 years and is available to start immediately. The monthly salary is 3,000,000 won. Applicants should hold or expect shortly to hold a PhD in psychology, cognitive science, neuroscience, biomedical engineering, 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 an internationally respected peer-reviewed journal.

Graduate Student:

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

Publications

Peer-reviewed journal

A key role of orientation in the coding of visual motion direction
Moon, J., Tadin*, D., & Kwon*, O.-S. (2022)
Psychonomic Bulletin & Review  Link | PDF

Testing the efficacy of vision training for presbyopia: alternating-distance training does not facilitate vision improvement
compared to fixed-distance training

Liza#, S. J., Choe#, S., & Kwon, O.-S. (2022)
Graefe’s Archive for Clinical and Experimental Ophthalmology 260:1551–1563  Link | PDF

Subjective optimality in finite sequential decision-making
Sin#, Y., Seon#, H., Shin, Y. K., Kwon*, O.-S., & Chung*, D. (2021)
PLoS Computational Biology 17(12):e1009633  Link | PDF
~ University Press Release (English | Korean)
~ Covered by 뉴시스 | 서울경제 | 매일경제 | 아시아경제

HisVA: a visual analytics system for learning history
Han, D., Parsad, G., Kim, H., Shim, J., Kwon, O.-S., Son, K. A., Lee, J., Cho, I., & Ko, S. (2021)
IEEE Transactions on Visualization and Computer Graphics  Link
~ University Press Release (Korean)
~ Covered by 연합뉴스 | 뉴스1 | 뉴시스 | 헤럴드경제 | 아시아경제 | 노컷뉴스

A computer-based method for the investigation of human behavior in the iterative chicken game
Kim#, S.-P., Kim#, M., Lee, J., Cho*, Y. S., & Kwon*, O.-S. (2021)
Frontiers in Psychology 12:576404  Link | PDF

Atypical visual motion-prediction abilities in autism spectrum disorder
Park#, W. J., Schauder#, K. B., Kwon, O.-S., Bennetto*, L., & Tadin*, D. (2021)
Clinical Psychological Science 9(5):944–960  Link

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

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

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

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: Biological Sciences 371:20150264  Link | PDF

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  Link

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  Link | PDF
~ University Press Release (UNISTUniversity of Rochester)
~ Covered by CBS Sports | Daily Mail | Vox | 연합뉴스 | SBS | 조선일보 | 서울신문 | 동아사이언스 | 뉴스1뉴시스 | 부산일보 | 전자신문

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  Link | PDF

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  LinkPDF

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  Link

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. (2010)
Journal of Motor Behavior 43(1):15–26  Link

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  Link | PDF

(#co-first authors; *co-senior authors)

Conference abstracts

Environmental motion presented ahead of body motion modulates the heading direction estimation
Saftari, L. N., & Kwon, O.-S. (2022)
Vision Sciences Society Annual Meeting

Motion streak facilitates motion deblurring
Choe, S., Han, C.-Y., Kim, H., & Kwon, O.-S. (2022)
Vision Sciences Society Annual Meeting

Confidence in perceptual estimation reflects behavioral variability, but not the biases
Moon, J., & Kwon, O.-S. (2022)
Vision Sciences Society Annual Meeting

The effect of stimulus size on the detection and discrimination of the Transient Twinkle
Han, C. Y., Choe, S., Kim, H., & Kwon, O.-S. (2022)
Vision Sciences Society Annual Meeting

Edge detection in flickering stimulus is modulated by eccentricity and eye movements
Choe*, S., Han, C., Kim, H., & Kwon, O.-S. (2021)
Association for Psychological Science Virtual Convention

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

Humans over-expect from the future chances in finite sequential decision problems
Shin, Y., Seon, H., Shin, Y., Chung, D., & Kwon, O.-S. (2019)
Society for Neuroscience (SfN) 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 Annual 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

Sequential effect on visual classification: The citrus classification paradigm
Yang, T., & Kwon, O.-S. (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

Adaptation to artificial and natural environment in visual motion perception
Kwon*, O.-S. (2015)
International Congress of Physiological Anthropology

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

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

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

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)

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)

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

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

Early correction model of human goal-directed movement
Kwon, O.-S., Shelton, J. N., & Pizlo, Z. (2009)
Vision Sciences Society Annual Meeting

Intermittent feedback model of goal-directed forearm movement
Kwon, O.-S., Shelton, J. N., & Pizlo, Z. (2008)
The 49th Annual Meeting of the Psychonomic Society

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

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 Meetin

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 *)

Conference proceedings

Modeling human movement with length-normalized action primitives
Shelton, J. N., Kwon, O.-S., & Chiu, G. (2008)
2008 American Control Conference 165–170

Rapid computation of time-optimal, open-loop forearm movement
Shelton, J. N., Kwon, O.-S., & Chiu, G. (2008)
Proceedings of the 17th World Congress of the International Federation of Automatic Control 41(2):14749–14754

Single feedback model of human goal-directed movement
Kwon, O.-S., Shelton, J. N., & Chiu, G. (2008)
The American Society of Mechanical Engineers (ASME) 2008 Dynamic Systems and Control Conference 763–769

News

2022

October 5–7
Seonggyu and Chang Yeong each gave a talk presentation at the fall conference of the Ergonomics Society of Korea.

September 26
Congratulations to Jongmin on his new paper published in Psychonomic Bulletin & Review!

August 29
Ju Hyun joined the lab as an M.S. student. Welcome to the lab, Ju Hyun!

August 23–26
Prof. Kwon was invited to give a talk at the 22nd International Meeting on Information Display. Seonggyu and Chang Yeong also attended the conference.

May 13–18
After two years of virtual meetings due to the pandemic, we are finally attending the Vision Sciences Society (VSS) 2022 Annual Meeting in person! Liana, Seonggyu, Jongmin, and Chang Yeong will each present their work on multisensory processing, motion perception, perceptual decision making, and temporal processing, respectively.

April 29
Jongmin has been accepted to Cold Spring Harbor Laboratory’s Computational Neuroscience: Vision course and further selected to receive financial support from Howard Hughes Medical Institute. This July, Jongmin will stay in New York for two weeks and learn from the world’s leading computational neuroscientists. Congratulations, Jongmin!

February 17–18
Seonggyu and Chang Yeong each gave a talk presentation at the annual meeting of the Korean Society of Cognitive and Biological Psychology.

January 10
Liza and Seonggyu’s paper on eye training is out in Graefe’s Archive for Clinical and Experimental Ophthalmology. Congratulations!

2021

December 16
A new paper co-first-authored by Yeonju, a formal undergraduate research intern in our lab, is now published in PLoS Computational Biology. This paper is the result of a close collaboration with Prof. Dongil Chung. University Press Release (English | Korean)

November 28–29
Seonggyu and Chang Yeong’s work, conducted in collaboration with Samsung Display Research Center, won the best student paper award at the fall conference of the Ergonomics Society of Korea. Congratulations!

September 29
Chang Yeong and Seonggyu’s paper won the silver award at the paper contest held by Samsung Display. Well done, guys!

July 15–16
Jongmin and Chang Yeong each gave a talk presentation at the annual meeting of the Korean Society of Cognitive and Biological Psychology. Jongmin won the best presentation award for his work on confidence judgments in Bayesian inference. Congratulations, Jongmin!

May 28
A new paper is out in Frontiers in Psychology! This work, conducted in collaboration with Prof. Sung-Phil Kim and Prof. Yang Seok Cho at Korea University, describes human behavior in competitive social interactions in terms of fairness using a computational model.

May 26–27
Seonggyu is attending the Association for Psychological Science Virtual Convention. He will give a talk presentation on the study he and Chang Yeong conducted in collaboration with Samsung Display Research Center.

March 1
Chang Yeong joined the lab as an M.S. student. Welcome to the lab!

2020

September 1
We are pleased to announce a new research grant funded by the National Research Foundation of Korea. This grant will support the collaborative research team led by Prof. Kwon in investigating the mechanisms of cognitive biases underlying social conflicts and polarization. University Press Release (English | Korean)

June 19–24
We are participating in the virtual meeting of the 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 visual motion perception. Come check them out!

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

2019

August 27
Seonggyu, Hyun-Jun, Jongmin, and Prof. 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
Prof. 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 17–22
Liza, Seonggyu, Jongmin, and Prof. 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 14–15
Liana, Seonggyu, Hyun-Jun, Jongmin, and Prof. Kwon are attending the Korean Society for Cognitive and Biological Psychology. Prof. Kwon will give a talk as a part of the symposium, and Seonggyu and Jongmin will each make a talk presentation.

2018

September 2
Now Jongmin starts his combined M.S.-Ph.D. program at our lab!

May 18–23
Seonggyu, Hyun-Jun, Jongmin, and Prof. 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 in Journal of Physiological Anthropology. Congratulations!

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

January 25–26
Seonggyu, Hyun-Jun, and Prof. Kwon are 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!