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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Are late positive potentials to emotional pictures affected by spatial cues?

Sand, Anders January 2009 (has links)
<p>Perceived distance between motivationally significant stimuli andobserver has been shown to affect arousal. To study effects ofperceived motion and distance on affective picture processing, eventrelatedpotentials were recorded in two experiments as neutral andunpleasant pictures were presented with different cues to induceperceptions of changes in spatial distance. The cues were either thetarget picture or independent circles that increased or decreased insize, or the target picture presented in a static small or large size. Inboth experiments, late positive potentials at centroparietal electrodeswere more pronounced, and self-reports more negative, forunpleasant compared to neutral stimuli. The results of theexperiments do not, however, provide evidence that inducedperceptions of motion or distance affect late positive potentials.</p>
2

Are late positive potentials to emotional pictures affected by spatial cues?

Sand, Anders January 2009 (has links)
Perceived distance between motivationally significant stimuli andobserver has been shown to affect arousal. To study effects ofperceived motion and distance on affective picture processing, eventrelatedpotentials were recorded in two experiments as neutral andunpleasant pictures were presented with different cues to induceperceptions of changes in spatial distance. The cues were either thetarget picture or independent circles that increased or decreased insize, or the target picture presented in a static small or large size. Inboth experiments, late positive potentials at centroparietal electrodeswere more pronounced, and self-reports more negative, forunpleasant compared to neutral stimuli. The results of theexperiments do not, however, provide evidence that inducedperceptions of motion or distance affect late positive potentials.
3

Lärares uppfattningar av lokala pedagogiska planer som ett medel att utveckla intresset för naturorienterande ämnen

Elmstedt, Kerstin January 2012 (has links)
I detta arbete görs en mindre studie av lärares uppfattning gällande planering och genomförande av NO-undervisning, i samband med arbetet med lokala pedagogiska planer. Intervjuer med lärare i grundskolan har genomförts semistrukturerade. Syftet var att undersöka hur lärare beskriver arbetet kring att upprätta lokala planer och hur de försöker hitta vägar för att stimulera ungdomar i deras intresse för naturvetenskap. De lärare som intervjuats är samtliga kopplade till ett pågående skolutvecklingsprojekt i Östergötland, KNUT-projektet, vilket jag kommit i kontakt med och kunnat använda i mig av i min studie. De intervjuade har varit yrkesverksamma lärare mellan 12 och 25 år. Tidigare studier har bl.a. visat att elever är intresserade av naturvetenskap i sitt vardagliga liv men inte i skolan. Forskning visar att fler och fler väljer bort att vidareutbilda sig inom naturvetenskapliga områden vilket går emot samhällets ökande behov av utbildade personer inom naturvetenskapliga arbeten. För att stimulera till ökat intresse finns studier och forskning att tillgå och några av dessa har jag använt mig av i mitt arbete. Resultatet av min studie indikerar att lärare inte upplever de nya kursplanerna i NO som svåra att läsa och förstå men flera upplever det svårt att veta hur mycket som ska tas upp och på vilken nivå undervisningen ska ligga. Lärarna upplever bedömningen svår och de saknar riktlinjer för den gentemot kursplanerna. Hur lärarna stimulerar eleverna för ökat intresse av NO-ämnena är väldigt olika. Flera lärare vill arbeta mer varierat och framför allt mycket praktiskt. För samtliga lärare genomfördes det få eller inga studiebesök utanför skolan. Diskussion som inlärningsmetod användes av några lärare och då främst mellan lärare och elev vid laborationer eller genomgångar. Denna arbetsmetod var dock ovanlig. Dessa resultat diskuteras gentemot tidigare studier och forskning samt skolverkets styrdokument.
4

The Influence of Individual Differences on Emotional Processing and Emotional Memory

Johnson, Patricia Lynn 18 June 2014 (has links)
Emotional material is better remembered than neutral material and some suggest this is reflected in different Event Related potentials (ERPs) to affective stimuli by valence. Inconsistent results may be due to individual differences, specifically the behavioral inhibition/behavioral activation (BIS/BAS) motivational system. This study sought to examine the relationship between motivational systems, emotional memory, and psychophysiological response to emotional pictures. While using EEG recording, subjects were shown 150 affective pictures and given a recall and yes/no recognition task after a 20 and 30-minute delay, respectively. Overall, differences were found by valence, but not consistently based on individual trait. Controlling for arousal and mood, results did not support previous research that suggested high BIS was more responsive to negative pictures while higher BAS was more responsive to positive images. The role of ERP methodology and arousal are discussed, along with future directions.
5

Slöjdlärarare och den lokala pedagogiska planeringen : Ett arbete i hur slöjdlärare förhåller sig till den lokala pedagogiska planeringen i undervisningen

Dahlin Klein, Miriam January 2013 (has links)
Syftet med mitt arbete är att få inblick i hur slöjdlärare arbetar med den Lokala pedagogiska planeringen (LPP) och vilken funktion den fyller. Studiens fokus ligger i hur slöjdlärana använder den lokala pedagogiska planeringen under lektioner och hur de arbetar fram den. För att få svar på mina frågeställningar genomförde jag intervjuer med slöjdlärare. Mitt resultat visar att slöjdlärana inte får mycket tid till att skriva sin LPP vilket leder till att de ofta får sitta hemma på sin fritid och skriva. De anser att den är ett bra stöd för dem själva och även för eleverna under lektionerna. Undersökningen visar även att lärarna har nytta av den lokala pedagogiska planeringen, som de menar är ett uppdrag som påförts dem "uppifrån". Genom undersökningen har jag fått större förståelse för vilken nytta den lokala pedagogiska planeringen kan ha för lärare och elever i undervisningen.
6

The Association Between Normative Variation in Parenting and Youth Emotional Reactivity Assessed via EEG

Danzo, Sarah 29 August 2017 (has links)
No description available.
7

Fluid field analysis on a flexible combustor for a hybrid Solar / Brayton system : A numerical study

JACQUEMARD, PAUL January 2020 (has links)
Recent improvements to concentrating solar dish systems lead to further focus on hybridization systems for small-scale power generation applications. Variability of the solar load creates new requirements for combustion systems. This thesis presents a CFD simulation of the air flow inside a new combustor design for the combination of an impinging air solar receiver and a MGT. The system consists of a LPP tubular combustor with radial main swirler and central pilot burner. Focus is made on the pressure loss at the downstream impinging cooling wall for appropriate flow distribution between reacting and bypass air. Heat transfer is not studied due to lack of time. A fully-hexahedral multi-zones mesh of the system without fuel injection has been generated with Ansys ICEM software, making use of its O-grid capabilities. A realizable k-epsilon model is used for turbulence modelling. Several impinging hole’s diameters are studied to find the right balance between the two streams. Streamlines are also observed to confirm the location of recirculation zones and recommend design improvements. / Nya förbättringar av koncentrerade solskålssystem leder till ytterligare fokus på hybridsystem för småskaliga applikationer för elproduktion. Ojämn solstrålning skapar nya krav på förbränningssystem. Detta examensarbete presenterar en CFD-simulering av luftflödet i en ny förbränningsdesign för en kombination av en solfångare med forcerad konvektionskylning och en mikrogasturbin (MGT). Systemet består av en LPP-rörbrännare med radiellt virvelsystem och central pilotbrännare. Studien fokuserar på tryckförlusten vid slaghålsväggen, som används för kylning vid förbränning, och lämplig flödesfördelning mellan reagerande- och förbigående flöde. Värmeöverföring studeras inte på grund av tidsbrist. Ett helt sexkantigt nät med flera zoner i systemet utan bränsleinsprutning har genererats med Ansys ICEM-programvara som använder O-nätfunktioner. En realiserbar k-epsilon-modell används för turbulensmodellering. Flera slaghålsdiametrar studeras för att hitta rätt balans mellan de två strömmarna. Även strömlinjer observeras för att bekräfta placeringen av återcirkulationszoner och kunna rekommendera förbättringar av designen.
8

Focused Attention vs. Open Monitoring: An Event-Related Potential Study of Emotion Regulation by Two Distinct Forms of Mindfulness Meditation

Raldiris, Tarah L 01 January 2017 (has links)
This study investigated the effects of two novel forms of 8-week mindfulness meditation training, focused attention (FA) and open monitoring (OM), relative to an established training, mindfulness-based cognitive therapy (MBCT), on early emotional reactivity to negative emotional images as assessed by electroencephalography (EEG). Data on the late-positive potential (LPP) were analyzed to address whether the three mindfulness interventions attenuated the LPP from pre- to post-intervention, and if significant differences existed between groups in LPP at post-intervention. Rather than an attenuation, results indicated an average increase in LPP amplitude from pre- to post-intervention. No significant differences were found in the LPP between the training conditions at post-intervention. These results provide preliminary evidence that mindfulness training in novice practitioners may heighten initial emotional reactivity. Further, well-designed research is needed to examine a wider range of neural responses to better understand emotion regulation process effects of different forms of mindfulness training.
9

Attention to the periphery attenuates the EPN and LPP

Syrjänen, Elmeri January 2011 (has links)
Current research shows that emotions have an important role in guiding attention and cognitions especially when the emotional stimuli are affective. Load theory proposes that when the perceptual load on attention is sufficiently high, irrelevant emotional stimuli is no longer attended to and thus will not produce a distracting effect. In this study 18 participants performed two discrimination tasks where their attention was manipulated spatially. To investigate the effect of spatial attention on ERP components, emotional pictures in 14 different semantic categories were shown while EEG was recorded. The results indicate that a successful perceptual load was achieved, reflected in the behavioral data that show there was a clear difference in performance between tasks. Further the results indicate that a strong effect was achieved in the mean amplitudes of both EPN and LPP corresponding to the semantic categories of pictures. Critically directing the attention to the periphery while emotionally salient pictures were presented attenuated the mean amplitude of both EPN and LPP.
10

Reaction Formation and Homophobia: An ERP Examination

Yakub, Krista Grace 01 January 2013 (has links)
Homophobia in men may be, in part, due to reaction formation rooted in unacceptable same-sex attraction. Previous studies have not confirmed a covert same-sex attraction in homophobic men, which is necessary for a reaction formation theory of homophobia. This study sought to reveal possible covert same-sex attraction in homophobic men. In this study, heterosexual and homosexual male erotic images were presented in a passive S1/S2 stimulus prediction design to 48 self-identified heterosexual participants, grouped by homophobia. Three event-related potential responses related to valenced emotional processing were examined: the medial frontal negativity (MFN), the late positive potential (LPP), and the positive frontal slow wave (FSW). While homophobic men have a larger FSW in response to erotics across the board, F(1,46) = 3.88, p = .055, no significant interactions between homophobia and image content were found. As such, homophobic men may have more interest in erotic images in general, but this study does not demonstrate that homophobic men find homosexual erotics appetitive.

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