Chamilothori, Kynthia

Janssen, Naud

Plaisier, Myrthe A.

English

In vision, stimulus pleasantness has been shown to relate to complexity following an inverted U-curve or a linear relationship. At the same time, geometric patterns that are more associated with nature are found to be perceived as more pleasant. However, little is known about how pleasantness relates to naturalness and complexity of tactile geometric patterns. Therefore, we investigated whether haptic pleasantness depends on complexity, and naturalness of a geometric pattern. Because exploratory hand movements have been shown to depend on the haptic property to be extracted and can depend on complexity we also recorded hand movements. We examined the influence of perceived naturalness and complexity on movement speed

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 Haptic pleasantness, naturalness, and complexity, ofgeometric raised line drawingsCitation for published version (APA):Plaisier, M. A., Janssen, N., & Chamilothori, K. (2023). Haptic pleasantness, naturalness, and complexity, ofgeometric raised line drawings. Poster session presented at IEEE World Haptics 2023, Delft, Netherlands.Document status and date:Published: 11/07/2023Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can beimportant differences between the submitted version and the official published version of record. Peopleinterested in the research are advised to contact the author for the final version of the publication, or visit theDOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and pagenumbers.Link to publicationGeneral rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            • Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            • You may not further distribute the material or use it for any profit-making activity or commercial gain            • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the “Taverne” license above, pleasefollow below link for the End User Agreement:www.tue.nl/taverneTake down policyIf you believe that this document breaches copyright please contact us at:openaccess@tue.nlproviding details and we will investigate your claim.Download date: 05. Oct. 2023Haptic pleasantness, naturalness, and complexity, of geometric raisedline drawingsMyrthe A. Plaisier1 and Naud R.H. Janssen1 and Kynthia Chamilothori 1I. INTRODUCTIONIn vision, stimulus pleasantness has been shown to relateto complexity following an inverted U-curve [1] or a linearrelationship [2]. At the same time, geometric patterns thatare more associated with nature are found to be perceivedas more pleasant [3]. However, little is known about howpleasantness relates to naturalness and complexity of tactilegeometric patterns. Therefore, we investigated whether hap-tic pleasantness depends on complexity, and naturalness ofa geometric pattern. Because exploratory hand movementshave been shown to depend on the haptic property to beextracted [4] and can depend on complexity [5] we alsorecorded hand movements. We examined the influence ofperceived naturalness and complexity on movement speed.II. METHODTwenty right-handed participants (age range 20–29 years)took part in the study after giving informed consent. Thestudy was approved by the local ethical review board.Stimuli consisted of 15 raised line patterns (Figure 1).The stimulus was fixed on a table below a camera. Thecamera images were used to track the tip of the indexfinger with a custom Python script using the OpenCV andMediapipe Python libraries. Participants were blindfoldedand started with the right index finger in the lower rightcorner. They were asked to explore up to a maximum of 30s. After exploration, they rated the stimulus on pleasantness,naturalness, and complexity using free magnitude estimation.They rated each stimulus twice in blocked-random order.III. RESULTSFirst, the ratings for pleasantness, naturalness and com-plexity were converted to z-scores. The lmerTest pack-age in R were used to run a Linear Mixed Model(LMM) with pleasantness rating as dependent variable andnaturalness and complexity ratings as independent vari-ables (Pleasantness ∼ naturalness + complexity +(1|Participant)). The LMM showed a significant positiverelation between pleasantness and naturalness (β = 0.34, t =10.5, p < 0.0001) and a significant negative relation betweenpleasantness and complexity (β = −0.18, t = −6.1, p <0.0001).From the hand tracking data we calculated the averagespeed for each trial. To gain insight into possible effects of1M.A.P, N.R.H.J and K.C. are with the Human TechnologyInteraction group of Eindhoven University of Technology, 5612AZ, Eindhoven, The Netherlands. Email:(m.a.plaisier,k.chamilothori)@tue.nlof naturalness and complexity on the speed of the exploratorymovements we again used an LMM (Average speed ∼naturalness+complexity+(1|Participant)). This showeda significant negative relation for complexity (β = −5.1, t =−14.1, p < 0.0001), with participants making slower move-ments with increasing complexity. The relation betweenspeed and naturalness was not significant (β = −0.14, t =−0.3, p = 0.75).Fig. 1. The 15 geometric raised line drawings (Zytech Swellpaper)presented in the experiment. Line shape, spatial frequency and orientationwere varied to ensure variations in perceived naturalness and complexity.Liens were rotated over a random angle between -10◦ and 10◦ (middle row)or -20◦ and 20◦ (bottom row).IV. DISCUSSIONBoth naturalness and complexity were predictors for hap-tic pleasantness, where the relation with complexity wasnegative and with naturalness positive. This is consistentwith visual literature. Movement speed depended on thecomplexity, and not on naturalness, showing that exploratorymovements were slower for more complex scenes.REFERENCES[1] D. E. Berlyne, “Novelty, complexity, and hedonic value,” Perception &Psychophysics, vol. 8, no. 5, pp. 279–286, 1970.[2] Y. Güçlütürk, R. H. A. H. Jacobs, and R. v. Lier, “Liking versuscomplexity: Decomposing the inverted U-curve,” Frontiers in HumanNeuroscience, vol. 10, 2016.[3] K. Chamilothori, R. Lemmens, Ö. Karaman-Madan, and Y. de Kort,“Effects of dappled light patterns on preference, fascination, andrestoration in an online study,” in Proceedings of Lux Europa 2022.Institute of Electrical and Electronics Engineers, 2022.[4] S. J. Lederman and R. L. Klatzky, “Hand movements: a window intohaptic object recognition.” Cognitive Psychology, vol. 19, pp. 342–368,1987.[5] P. J. Locher and R. W. Simmons, “Influence of stimulus symmetry andcomplexity upon haptic scanning strategies during detection, learning,and recognition tasks,” Perception & Psychophysics, vol. 23, no. 2, pp.110–116, 1978.

Haptic pleasantness, naturalness, and complexity, of geometric raised line drawings

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Haptic pleasantness, naturalness, and complexity, of geometric raised line drawings

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