{"id":6426,"date":"2026-10-19T09:48:53","date_gmt":"2026-10-19T09:48:53","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-salfraedi-anton-lukashevich\/"},"modified":"2026-10-19T09:48:53","modified_gmt":"2026-10-19T09:48:53","slug":"doktorsvorn-i-salfraedi-anton-lukashevich","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-salfraedi-anton-lukashevich\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed s\u00e1lfr\u00e6\u00f0i &#8211; Anton Lukashevich"},"content":{"rendered":"<div class=\"field-items\">\n<div class=\"field-item even\" property=\"content:encoded\">\n<p>\u00deri\u00f0judaginn 25. n\u00f3vember 2025 ver Anton Lukashevich doktorsritger\u00f0 s\u00edna \u00ed s\u00e1lfr\u00e6\u00f0i vi\u00f0 S\u00e1lfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands. Ritger\u00f0in ber heiti\u00f0: Er safnskynjun athyglish\u00e1\u00f0? Attention in the crowd: probing ensemble perception attentional dependencies.<\/p>\n<p>Andm\u00e6lendur eru dr. Tatiana Aloi Emmanouil, d\u00f3sent vi\u00f0 Baruch College, New York, og dr. Jonathan S. Cant, d\u00f3sent vi\u00f0 University of Toronto Scarborough.<\/p>\n<p>Umsj\u00f3narkennari og lei\u00f0beinandi var Hei\u00f0a Mar\u00eda Sigur\u00f0ard\u00f3ttir, pr\u00f3fessor. Auk hennar s\u00e1tu \u00ed doktorsnefnd dr. Igor Utochkin og dr. Sabrina Hansmann-Roth.<\/p>\n<p>Ragnar P\u00e9tur \u00d3lafsson, pr\u00f3fessor og varadeildarforseti S\u00e1lfr\u00e6\u00f0ideildar, stj\u00f3rnar ath\u00f6fninni sem fer fram \u00ed H\u00e1t\u00ed\u00f0asal H\u00e1sk\u00f3la \u00cdslands og hefst kl. 9.00.<\/p>\n<p><strong>\u00c1grip <\/strong><\/p>\n<p>Safnskynjun gerir f\u00f3lki kleift a\u00f0 draga hratt saman t\u00f6lfr\u00e6\u00f0ilegar uppl\u00fdsingar \u00far umhverfinu og \u00feannig sni\u00f0ganga takmarkanir \u00ed vinnsluminni. Hins vegar er enn \u00f3lj\u00f3st hversu h\u00e1\u00f0 h\u00fan er athygli. \u00cd \u00feessari doktorsritger\u00f0 er kanna\u00f0 hvort safnskynjun s\u00e9 sj\u00e1lfvirk e\u00f0a krefjist athygli, me\u00f0 \u00e1herslu \u00e1 sj\u00f3nr\u00e6na eiginleika \u00e1 l\u00e1g- og mi\u00f0stigi \u00e1 bor\u00f0 vi\u00f0 halla og lengd. Doktorsverkefni\u00f0 tekur til \u00feriggja ranns\u00f3kna sem sameina atferlisverkefni og heilal\u00ednurit.\u00a0Grein 1 t\u00f3k til \u00feess hvort breytingar \u00e1 me\u00f0alhalla \u00ed safnskynjun v\u00e6ru greindar sj\u00e1lfvirkt. \u00deetta var kanna\u00f0 me\u00f0 m\u00e6lingum \u00e1 atviksh\u00e1\u00f0u spennu\u00fe\u00e1ttunum vMMN og P3. Breytingar sem \u00fe\u00e1tttakendur veittu athygli v\u00f6ktu P3-\u00fe\u00e1ttinn, en breytingar sem \u00feeir hunsu\u00f0u leiddu ekki til vMMN, sem bendir til a\u00f0 ekki hafi \u00e1tt s\u00e9r sta\u00f0 forathugunarbundin vinnsla.\u00a0\u00cd grein 2 var pr\u00f3fa\u00f0 hvort safn hluta s\u00e9 sj\u00e1lfvirkt flokka\u00f0 eftir dreifingu eiginleika \u00e1reitanna. vMMN kom fram vi\u00f0 flokkun eftir lengd, en ekki vi\u00f0 flokkun eing\u00f6ngu eftir halla, sem gefur til kynna a\u00f0 sj\u00e1lfvirkni s\u00e9 h\u00e1\u00f0 eiginleikum safnsins.\u00a0\u00cd grein 3 var athygli st\u00fdrt me\u00f0 Posner-v\u00edsbendum. Ni\u00f0urst\u00f6\u00f0ur s\u00fdndu a\u00f0 f\u00f3lk er \u00f3f\u00e6rt um a\u00f0 meta me\u00f0alhalla safns s\u00e9 \u00fev\u00ed ekki veitt athygli, \u00f3l\u00edkt \u00fev\u00ed sem gerist vi\u00f0 mat \u00e1 st\u00f6kum hlutum. \u00deetta sta\u00f0festir a\u00f0 athygli er nau\u00f0synleg fyrir n\u00e1kv\u00e6ma \u00farvinnslu \u00ed safnskynjun.\u00a0Heildarni\u00f0urst\u00f6\u00f0ur s\u00fdna a\u00f0 safnskynjun er ekki a\u00f0 \u00f6llu leyti sj\u00e1lfvirk, s\u00e9rstaklega hva\u00f0 var\u00f0ar skynjun \u00e1 halla, og krefst b\u00e6\u00f0i r\u00fdmis- og valbundinnar athygli til a\u00f0 n\u00e1 fram r\u00e9ttum uppl\u00fdsingum. \u00deessar ni\u00f0urst\u00f6\u00f0ur hafa \u00e1hrif \u00e1 kenningar um sj\u00f3nr\u00e6na skynjun og undirstrika hlutverk athyglinnar \u00ed vinnslu samantektart\u00f6lfr\u00e6\u00f0i sj\u00f3nr\u00e6nna \u00e1reita.<\/p>\n<p><strong>Abstract <\/strong><\/p>\n<p>In a world where we constantly process visual information : from scanning a busy street to spotting patterns in data &#8211; how does our brain quickly summarize scenes without getting overwhelmed? Ensemble perception enables the rapid extraction of summary statistics from visual scenes, bypassing capacity limitations, but its dependence on attention remains debated. This thesis investigates whether ensemble processing operates automatically or requires attentional resources, focusing on low- and mid-level features like orientation and length, through three studies combining behavioural paradigms and electroencephalography (EEG).\u00a0Study I examined automatic detection of ensemble mean orientation changes using visual mismatch negativity (vMMN) in oddball tasks. Attended changes elicited P3 component, but unattended changes produced no vMMN, indicating no pre-attentive processing. Study II tested automatic parsing of spatially intermixed objects into categories based on feature distributions. vMMN emerged for length-based segmentation but not orientation alone, suggesting feature-specific automaticity. Study III manipulated spatial attention via Posner cueing; ensemble orientation judgments dropped to chance on invalid cues, unlike single items, confirming attention&#8217;s necessity.\u00a0Overall, findings demonstrate that ensemble perception is not fully automatic, particularly for orientation, requiring spatial and selective attention for accurate extraction. Implications extend to visual cognition theories, emphasizing attention&#8217;s gating role in summary statistics processing.<\/p>\n<p><strong>Um doktorsefni<\/strong><\/p>\n<p>Anton Lukashevich f\u00e6ddist \u00ed Minsk \u00ed Hv\u00edta-R\u00fasslandi \u00e1ri\u00f0 1992. Hann \u00fatskrifa\u00f0ist fr\u00e1 Sechenov-h\u00e1sk\u00f3la \u00ed Moskvu \u00e1ri\u00f0 2015 me\u00f0 gr\u00e1\u00f0u \u00ed almennum l\u00e6knisfr\u00e6\u00f0um. \u00c1ri\u00f0 2017 s\u00e9rh\u00e6f\u00f0i hann sig \u00ed taugafr\u00e6\u00f0i vi\u00f0 Ranns\u00f3knarmi\u00f0st\u00f6\u00f0 fyrir taugafr\u00e6\u00f0i. Fr\u00e1 2018 hefur Anton kennt vi\u00f0 Deild fyrir venjulega l\u00edfe\u00f0lisfr\u00e6\u00f0i vi\u00f0 Sechenov-h\u00e1sk\u00f3la. \u00c1ri\u00f0 2022 h\u00f3f hann doktorsn\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands undir handlei\u00f0slu Hei\u00f0u Mar\u00edu Sigur\u00f0ard\u00f3ttur pr\u00f3fessors og Igors Utochkin, H\u00e1sk\u00f3lanum \u00ed Chicago, Bandar\u00edkjunum. \u00c1 me\u00f0an \u00e1 n\u00e1mi Antons st\u00f3\u00f0 kenndi hann vi\u00f0 S\u00e1lfr\u00e6\u00f0ideild og L\u00e6knadeild H\u00e1sk\u00f3la \u00cdslands.<\/p>\n<\/div><\/div>","protected":false},"featured_media":5813,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2025-11-25T09:00:00+00:00","_phd_date_end":"2025-11-25T12:00:00+00:00","_phd_location":"A\u00f0albygging H\u00e1t\u00ed\u00f0asalur","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"Er safnskynjun athyglish\u00e1\u00f0? Attention in the crowd: probing ensemble perception attentional dependencies","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_salfraedi_anton_lukashevich","_phd_source_node_id":"442814","_phd_source_type":"vidburdir","_phd_member_id":967,"footnotes":""},"phd_school":[60,75],"phd_discipline":[76],"class_list":["post-6426","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-heilbrigdisvisindasvid","phd_school-salfraedideild","phd_discipline-phd-i-salfraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6426","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6426\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/5813"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6426"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6426"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}