{"id":4678,"date":"2022-08-31T20:05:42","date_gmt":"2022-08-31T18:05:42","guid":{"rendered":"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/?page_id=4678"},"modified":"2022-12-08T16:59:21","modified_gmt":"2022-12-08T15:59:21","slug":"article-3","status":"publish","type":"page","link":"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/article-3\/?lang=en","title":{"rendered":"Perception of contact forces"},"content":{"rendered":"\n<p>The demand for\u00a0natural haptic feedback on touch screens\u00a0such as\u00a0smartphones and car control panels has been rapidly growing in recent years. One such feedback technology, vibrotactile stimulation, is already incorporated into many consumer devices but provides only a general vibration sensation to the user&rsquo;s\u00a0fingers and does not work well on mechanically grounded\u00a0screens.<\/p>\n\n\n\n<p>\u200bFriction-based tactile feedback solutions have recently been demonstrated as a good\u00a0alternative actuation approach. The development of these novel interfaces has raised interest in touch-based human-machine interactions while also highlighting the\u00a0need for appropriate\u00a0high-fidelity strategies for tactile rendering. Such new approaches face the limitation that little is known about the sensory mechanisms that mediate human perception of frictional cues.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"260\" height=\"195\" data-id=\"4865\" src=\"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-content\/uploads\/sites\/13\/2022\/11\/Livre_haptique.png\" alt=\"\" class=\"wp-image-4865\" \/><figcaption class=\"wp-element-caption\">Haptic children book<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"846\" height=\"667\" data-id=\"4863\" src=\"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-content\/uploads\/sites\/13\/2022\/11\/Ecran_ultrasons.png\" alt=\"\" class=\"wp-image-4863\" srcset=\"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-content\/uploads\/sites\/13\/2022\/11\/Ecran_ultrasons.png 846w, https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-content\/uploads\/sites\/13\/2022\/11\/Ecran_ultrasons-300x237.png 300w, https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-content\/uploads\/sites\/13\/2022\/11\/Ecran_ultrasons-768x606.png 768w\" sizes=\"auto, (max-width: 846px) 100vw, 846px\" \/><figcaption class=\"wp-element-caption\">Active touch with changing friction<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"970\" height=\"694\" data-id=\"4867\" src=\"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-content\/uploads\/sites\/13\/2022\/11\/Capture-decran-2022-11-23-a-10.01.26.png\" alt=\"\" class=\"wp-image-4867\" srcset=\"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-content\/uploads\/sites\/13\/2022\/11\/Capture-decran-2022-11-23-a-10.01.26.png 970w, https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-content\/uploads\/sites\/13\/2022\/11\/Capture-decran-2022-11-23-a-10.01.26-300x215.png 300w, https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-content\/uploads\/sites\/13\/2022\/11\/Capture-decran-2022-11-23-a-10.01.26-768x549.png 768w\" sizes=\"auto, (max-width: 970px) 100vw, 970px\" \/><figcaption class=\"wp-element-caption\">Experimental platform to vary forces<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<p>\u200bVirtual geometric features and complex textures (e.g., buttons, edges, drawings, fabrics)\u00a0can be rendered on flat screens via\u00a0ultrasonic vibrations that modulate\u00a0the friction force\u00a0experienced by the user. However, optimizing\u00a0these tactile sensations requires one to understand which components of the frictional signal are critical and how the\u00a0intensity of each component\u00a0should be scaled according to the dynamics of the interaction.\u00a0<\/p>\n\n\n\n<p>\u200bIn this project, we investigate how ultrasonic vibration waveforms\u00a0with different durations and slopes are perceived by humans, as well as\u00a0what kind of high-level percepts (such as edges, bumps and holes) they generate. To that end, we physically measure the frictional patterns that the finger experiences during ultrasonic stimulation, and we then correlate these results with the verbal reports of the users.<\/p>\n\n\n\n<p>\u200bThe long-term goals of this project are to\u00a0understand how to generate tactile features that are perceived unambiguously by users\u00a0and to leverage this knowledge to\u00a0guide the design of friction-based tactile stimuli\u00a0on future tactile displays that provide haptic feedback.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The demand for\u00a0natural haptic feedback on touch screens\u00a0such as\u00a0smartphones and car control panels has been rapidly growing in recent years. One such feedback technology, vibrotactile stimulation, is already incorporated into many consumer devices but provides only a general vibration sensation to the user&rsquo;s\u00a0fingers and does not work well on mechanically grounded\u00a0screens. \u200bFriction-based tactile feedback solutions [&hellip;]<\/p>\n","protected":false},"author":146,"featured_media":4863,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-4678","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-json\/wp\/v2\/pages\/4678","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-json\/wp\/v2\/users\/146"}],"replies":[{"embeddable":true,"href":"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-json\/wp\/v2\/comments?post=4678"}],"version-history":[{"count":4,"href":"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-json\/wp\/v2\/pages\/4678\/revisions"}],"predecessor-version":[{"id":4985,"href":"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-json\/wp\/v2\/pages\/4678\/revisions\/4985"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-json\/wp\/v2\/media\/4863"}],"wp:attachment":[{"href":"https:\/\/pages.isir.upmc.fr\/dgueorguiev\/wp-json\/wp\/v2\/media?parent=4678"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}