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Vpliv emocionalnih dražljajev na P300 pri nalogi detekcije redkih dražljajev
Tomat, Nastja (Author), Repovš, Grega (Mentor) More about this mentor... This link opens in a new window

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Abstract
Čustveni dražljaji so tako pomembni za optimalno delovanje v okolju, da avtomatsko izzovejo povišano pozornost, kar omogoča prednost pri nadaljnjem procesiranju in ustrezen vedenjski odziv. Vpliv čustev na pozornost lahko preučujemo s pomočjo elektroencefalografije (EEG), specifično z uporabo z dogodkom povezanih potencialov. Val P300 je pozitivni potencial z največjo amplitudo na sredini skalpa, ki se pojavi okrog 300 ms po prikazu dražljaja pri nalogi prepoznavanja redkih dražljajev. Odraža procese kategorizacije in primerjave novega dražljaja s starim ter posodabljanje mentalne reprezentacije v delovnem spominu. Namen raziskave je bil preučiti, kako na val P300 vplivajo čustvena vsebina dražljaja (negativni ali nevtralni), tip dražljaja (tarča ali motilec) in vsebina kategorizacije (glede na čustveno vsebino ali prisotnost ljudi). 32 udeležencev je med beleženjem EEG-signala izvajalo nalogo vidnega prepoznavanja redkih dražljajev s štirimi pogoji: prepoznavanje negativnih dražljajev, nevtralnih dražljajev, dražljajev z ljudmi in dražljajev brez ljudi. V vseh pogojih smo zabeležili P300 z največjo amplitudo parietalno 500 ms po prikazu dražljaja in pozni pozitivni potencial, ki je vztrajal do 1000 ms po dražljaju ali dlje. Negativni dražljaji so tako v vlogi tarč kot motilcev vzbudili večjo amplitudo P300 in poznega pozitivnega potenciala od nevtralnih v časovnem intervalu med 370 in 1200 ms po dražljaju. Vsebina kategorizacije ni vplivala na amplitudo P300 in poznega pozitivnega potenciala, prav tako ne tip dražljaja. Zaključili smo, da čustveni dražljaji zaradi svoje intrinzične motivacijske relevantnosti pritegnejo dodatne pozornostne vire ne glede na to, ali so relevantni za nalogo in ali smo nanje načrtno pozorni.

Language:Slovenian
Keywords:pozornost, čustva, elektroencefalografija, z dogodkom povezani potenciali, P300
Work type:Master's thesis/paper (mb22)
Organization:FF - Faculty of Arts
Year:2019
Views:288
Downloads:152
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Secondary language

Language:English
Title:The influence of emotional stimuli on P300 in an oddball paradigm
Abstract:
Due to their relevance to one's optimal adaptation to their environment, emotional stimuli automatically capture heightened attention which facilitates their further processing and optimal behavioral outcomes. The influence of emotion on attention can be investigated with electroencephalography (EEG), specifically by employing the event-related potentials technique. P300 is positive potential with the maximal amplitude approximately 300 ms post-stimulus at midline electrodes which is usually elicited in an oddball task. It reflects categorization, comparison of new stimuli with previous ones and updating of the mental model in the working memory. The aim of our study was to investigate how the P300 is affected by the emotional content of the stimuli (negative or neutral), stimuli type (target or distractor) and categorization (based on emotional content or the presence of humans). During EEG recording 32 participants performed a visual three-stimuli oddball task with four conditions: identify negative stimuli, neutral stimuli, stimuli with people, and stimuli without people. In every condition we identified the P300 with the maximal parietal amplitude 500 ms post-stimulus and the late positive potential which persisted up to 1000 ms post-stimulus or longer. Both negative targets and negative distractors elicited larger P300 and late positive potential amplitudes than neutral ones between 370 and 1200 ms post-stimulus. Neither the type of categorization nor the type of stimuli affected the P300 and late positive potential amplitudes.

Keywords:attention, emotion, electroencephalography, event related potential, P300

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