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21.
  • Eckert, B., et al. (författare)
  • The recovery of brain function after hypoglycaemia in normal man
  • 1992
  • Ingår i: Diabetologia, 35, Suppl.1. ; , s. A43-
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • The aim of the present study was to evaluate the recovery of brain function after moderate hypoglycaemla in normal man. Hypoglycaemia was induced by an intravenous infusion of insulin (2.5 mU/kg) in seven healthy right-handed men aged 25.4+1.1 years (Mean • SD). The brain function was evaluated with P300-amplitude after auditory stimulus, reaction time measurements and EEG before, during (2.4+0.44 mmol/l for 70 min) and three times in the recovery period following hypoglycaemia. Hypoglycaemia caused a reduction in the P300-amplitude, a prolongation in reaction time and minor changes in the EEG-activity. 15 min after normalisation of the blood glucose level, the P300-amplitude was lower than during hypoglycaemia and still 1,5 hrs after normalisation of the blood glucose level, there was a marked reduction in the P3OO-amplitude. 4 hrs after normalisation of the blood glucose, the P300-amplitude was restituted. The reaction time was shorter 15 min after normalisation of the blood glucose compared to hypoglycaemia, but was not nermalised until 1,5 hrs after of recovery following hypoglycaemia. The EEG-changes were normalised 15 min after hypoglycaemia. We conclude that moderate hypglycaemia causes marked effects in P300 and reaction time and that brain function measured as P300 is not restored after 1,5 hrs but at 4 hrs after normalisation of hypoglycaemia.
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22.
  • Eriksson, T. Gerhard, et al. (författare)
  • Personality traits of prisoners as compared to general populations : signs of adjustment to the situation?
  • 2017
  • Ingår i: Personality and Individual Differences. - 0191-8869 .- 1873-3549. ; 107:1, s. 237-245
  • Tidskriftsartikel (refereegranskat)abstract
    • Two recent studies have challenged the well-established belief that offending behaviors are inversely related to the personality trait of conscientiousness. Therefore, the aim of this study was to explore prisoners’ levels of traits according to the Five-Factor Model (FFM) of personality compared to control groups, with a focus on conscientiousness. Two separate samples of inmates in Swedish high-security prisons were investigated in three studies. Inmates and non-inmates completed a Swedish-language translation of Goldberg’s (1999) International Personality Item Pool questionnaire (IPIP-NEO, Bäckström, 2007). Male inmates (n = 46) in Studies 1 and 2 scored higher on conscientiousness than non-inmates (norm data based on approximately 800 males, and a students’ sample), which conflicts with previous results. Study 3 further explored the conscientiousness differences on the facet level. Male and female inmates (n = 131) scored higher on order and self-discipline (even after an adjustment for social desirability) than students (n = 136). In conjunction with previous findings, these differences are interpreted as being either temporal or enduring adjustments to the prison environment. It is suggested that researchers and clinical teams should cautiously interpret the FFM factor of conscientiousness (and its facets) when planning the further treatment of inmates.
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23.
  • Faraon, Montathar, 1983-, et al. (författare)
  • Much more to it : the relation between Facebook usage and self-esteem
  • 2014
  • Ingår i: Proceedings of the 2014 IEEE 15th International Conference on Information Reuse and Integration. - Piscataway, NJ, USA : IEEE Systems, Man, and Cybernetics Society (SMC). - 9781479958801 ; , s. 87-92
  • Konferensbidrag (refereegranskat)abstract
    • The aim of this study was to examine closer the conflicting results from previous studies concerning the relation- ship between Facebook use and self-esteem using the Facebook Intensity Scale and Rosenberg’s Self-Esteem Scale (N = 107). In line with some previous studies, our data confirmed that there is a relationship between Facebook usage and self-esteem, but the applied scales allowed a more refined assessment of it. The results showed, after controlling for demographic variables, that participants with low Facebook intensity reported on average higher self-esteem than those who did not use Facebook or those with high Facebook intensity, while those with medium Facebook intensity had significantly higher self-esteem compared to the participants with high Facebook intensity. Future studies should address the underlying causal relations using a time-bound observation method.
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24.
  • Hansson, Erika, 1981-, et al. (författare)
  • Disordered eating in a general population : just an­other depressive symptom or a specific problem?
  • 2014
  • Konferensbidrag (refereegranskat)abstract
    • Previous research has shown that about 30% of adolescent girls and 15% of adolescent boys suffer from disordered eating (DE) which can be defined as problematic eating below criteria for eating disorders according to DSM-V (Hautala et al., 2008; Herpertz-Dahlman et al., 2008). Even sub-clinical unhealthy weight-control behaviors have predicted outcomes related to obesity and eating disorders five years later (Neumark-Sztainer et al., 2006). However, two issues question the validity of DE. First, in contrast to eating disorders, under- or overweight/obesity are not necessary parts of DE. Second, some symptoms and correlates of DE are similar to those of depression. E.g., parent-adolescent relationships seem to play an important role in explaining both DE (Hautala et al., 2011; Berge et al., 2010) and internalizing problems (Soenens et al., 2012). Thus, this study examined associations between DE and a wide range of internalizing and externalizing problems, parent-adolescent relationship characteristics, and food intake and sleep habits in a general population of adolescents. Comparing results with and without controlling for depression reveals whether DE is a specific problem or merely a depressive symptom. This study also explored whether DE and the other variables under study are associated independently of weight status (underweight, overweight/obesity, and normal weight), specific to under- or overweight, or spurious if taking weight status into account.The study is based on the first wave of an on-going longitudinal study, and all measures are child-reported (N=1,281). Adolescents attending grades 7 to 10 in a Southern Swedish municipality (age 12.5 to 19.3, M = 15.2, SD = 1.2) filled out questionnaires in class.  DE was measured using the SCOFF, a five-item screening scale validated for use in general populations (e.g. Muro-Sans et al., 2008; Noma et al., 2006).The results of univariate ANOVAs indicate that associations with DE were largely independent of weight status. Moreover, most associations with disordered eating were spurious when controlling for depression. However, some associations remained. Above and beyond depression effects, adolescents with DE reported lower self-esteem, stronger feelings of being over-controlled by their parents and active withholding of information towards them, consumption of fewer meals during the week, and higher levels of daytime sleepiness. Boys with ED slept more hours during the week and ate more fruits and vegetables than boys without ED. In conclusion, despite an overlap between depressive symptoms and disordered eating, this study provides ample evidence that sleep, nutrition habits, self-esteem, and parental control issues distinguish eating disordered adolescents from those suffering from general depressive symptoms.
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25.
  • Jensen, Jimmy, et al. (författare)
  • Effect of emotional content on brain activation patterns in a reality monitoring task
  • 2018
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Every day we take in large amounts of information from the external world, and we also synthesize representations of things or situations that we have not perceived through our senses. The ability to distinguish between a memory that contains representations from external world and a memory representing an imagined picture is necessary to make sense of the surroundings. This process is called reality monitoring. In the present study we aimed to confirm the existence of the reality monitoring network as reported by previous studies. Further, we wanted to extend these findings by investigating the effect of stimuli aversiveness on the reality monitoring processes and its neural correlates. Twenty-five subjects were included in the study after passing a somatic and psychiatric health screening. The subjects first completed an encoding task of 80 trials outside the scanner. Small descriptions of either an object or a situation (two or three word sentences) were presented on a computer screen. Immediately after the description was shown, a frame that was either empty or containing a picture related to the description was shown for three seconds. The subjects were instructed to look at the picture in the frame or imagine a relevant picture when the frame was empty. The subjects were then instructed to consider whether the pictures were “Unpleasant” or “Not unpleasant” by choosing between the two alternatives on the computer screen. A retrieval task was carried out as Blood-Oxygen Level Dependent (BOLD) fMRI data was collected. During this task the participants were presented with small descriptions that were either presented during the encoding task or they were new. The subjects were to decide whether they previously had viewed a picture associated with the description (a V trial), whether they had imagined a picture associated with the description (an I trial) or whether the description was entirely new (an N trial). The subjects completed a total of 140 randomly presented trials during two runs (20 trials of each category and 20 baseline trials). T2*-weighted functional MRI images were collected on a 3T General Electrics Signa HDx scanner. Data were analysed using SPM8.Overall, most of the trials were considered neutral, and this was true within both the I and the V conditions. Fewer I trials than V trials were considered aversive. The response times were longer in I compared to the V for the aversive trials, and there was a trend for the same effect for the neutral trials. There were no significant differences in response time between neutral and aversive trial. The analysis of the retrieval task behavioural data revealed a higher accuracy rate for aversive trials in the I than the V, while there was no effect for neutral trials. An ANOVA for the corresponding response times showed a main effect of source of encoding where responses were shorter in V than I trials. In paired tests this difference was significant for neutral trials. Paired tests of emotional content within source showed a difference between aversive and neutral trials for I. Successful retrieval and discrimination between sources of encoding generated activations in the left posterior precuneus. Activations of the anterior cingulate were also present. An effect of stimuli aversiveness on brain activation was present in mediolateral prefrontal cortex and the precuneus, indicating a stronger effort of these regions during retrieval of source memory linked to aversive stimuli.In summary, activation patterns in reality monitoring networks were replicated from earlier studies. Further, the results suggest that activations in overlapping networks are increased for aversive stimuli compared to neutral stimuli.
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26.
  • Jensen, Jimmy, et al. (författare)
  • Incentive motivational salience and the human brain
  • 2014
  • Ingår i: Restorative Neurology and Neuroscience. - 1878-3627. ; 32:1, s. 141-147
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper the concept of incentive motivational salience is briefly described, pioneering studies on the subject of the mesolimbic motivational system are reviewed, and studies we have been involved in conducting which elaborate on this subject are discussed. In particular, we aim to show that the mesolimbic motivational system is recruited as a reaction to primary and secondary reinforcers as a function of salience, that is independent of valence. Furthermore, studies showing that both psychological and pharmacological interventions can affect the function of the mesolimbic motivational system and how its' dysfunction is related to psychopathological phenomena with an emphasis on psychosis are discussed.
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27.
  • Johansson, Tobias (författare)
  • Generating artificial social networks
  • 2019
  • Ingår i: The Quantitative Methods for Psychology. - 1017-3455 .- 1543-8740. ; 15:2, s. 56-74
  • Tidskriftsartikel (refereegranskat)abstract
    • The study of complex social networks is an inherently interdisciplinary research area with applications across many fields, including psychology. Social network models describe, illustrate and explain how people are connected to each other and can, for example, be used to study information spread and interconnectedness of people with different kinds of traits. One approach to social network modelling, originating mainly in the physics literature, is to generate targeted kinds of social networks using models with specialized mechanisms while analyzing and deriving features of the models. Surprisingly though, and despite the popularity of this approach, there is no available functionality for generating a wide variety of social networks from these models. Thus, researchers are left to implement and specify these models themselves, restricting the applicability of these models. In this article, I provide a set of Matlab functions enabling the generation of artificial social networks from 22 different network models, most of them explicitly designed to capture features of social networks. Many of these models originate in the physics literature and may therefore not be familiar to psychological researchers. I also provide an illustration of how these models can be evaluated in terms of a simulated model comparison approach and how they can be applied to psychological research. With the already existing network functionality available in Matlab and other languages, this should provide a useful extension to researchers.
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28.
  • Johansson, Tobias, 1977- (författare)
  • Modeling test learning and dual-task dissociations
  • 2020
  • Ingår i: Psychonomic Bulletin & Review. - 1069-9384 .- 1531-5320. ; 27, s. 1036-1042
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Much of cognitive psychology is premised on the distinction between automatic and intentional processes, but the distinction often remains vague in practice and alternative explanations are often not followed through. For example, Hendricks, Conway and Kellogg (Journal of Experimental Psychology: Learning, Memory, and Cognition, 39, 491–1500, 2013) found that dual tasks at training versus at test dissociated performance in two different artificial grammar learning tasks. This was taken as evidence for underlying automatic and intentional processes. In this article, a different explanation is considered based on test learning and similarity, where participants are assumed to update their knowledge at test. Contrasting formal memory models of test learning are implemented, and it is concluded that the models account for the relevant dissociations without assuming a distinction between automatic and intentional processes.
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29.
  • Johansson, Tobias (författare)
  • Test learning as an explanation of dual task dissociations in implicit learning
  • 2014
  • Konferensbidrag (refereegranskat)abstract
    • Artificial grammar learning (AGL) has been used extensively to study implicit learning. In this task participants first observe letter sequences generated by a grammar. In a later test phase participants are asked to distinguish new grammatical and ungrammatical sequences. Participants are able to do this, both when the letters instantiating the grammar remain the same (standard AGL) and when the letters are changed between training and test (transfer AGL). Virtually all models of AGL assume that there is no learning during the test phase. Yet, test learning can occur in AGL and the structural constraints of a grammar can imply useful cues at test as well as at training. For example, grammatical test sequences are often more similar to each other than are ungrammatical test sequences to each other. Similarity to test sequences observed so far can then be used as a cue for classification. In the current research I used an episodic memory model, Minerva II, in order to simulate a recent study by Hendricks et al. (2013). They found that for standard AGL performing dual tasks at test was more detrimental to performance than dual tasks at training. For transfer AGL performing dual tasks at training reduced performance as much as dual tasks at test. The authors interpreted these results as revealing automatic vs. intentional process in AGL: transfer AGL requires intentional processes at both training and test, whereas standard AGL requires intentional processes at test but only automatic processes at training. I modelled these experiments using a version of Minerva II extended to learn at test. The model encodes sequences probabilistically into memory based on a learning rate at both training and test. Each test sequence is classified based on the similarity to sequences encoded in memory so far, so that test sequences also influence classification. The model does not distinguish between automatic and intentional processes. The learning rate at training was varied independently of the learning rate at test in order to simulate dual task manipulations in different phases of the task. In order to model transfer AGL I used a simple repetition coding scheme in Minerva II. For standard AGL the simulations revealed that learning rate at test had a much greater impact on classification than learning rate at training in Minerva II.  In contrast, for transfer AGL the effects of changing learning rates at training was the same as changing learning rate during test. In essence, the empirical data may not reveal automatic vs. intentional processes, but simply effects of a single similarity process. The simulation results and the notion of test learning invites useful avenues for further computational and empirical research in order to establish the processes involved in implicit learning. 
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30.
  • Lenninger, Sara (författare)
  • Iconic attitude and how similar is similarity
  • 2019
  • Konferensbidrag (refereegranskat)abstract
    • Pictures and other visio-spatial signs with iconicity diverge in expression, and in how they operate on meaning. Like all signs, pictures are polysemous (Groupe µ 1992) and have several layers of meaning - such as being perceptual objects and signs, having pragmatic and contextual meanings etc. (Medin et al 1993; Tversky 1977). Pictures also rely on iconic meaning (Sonesson 1989). Similarity is a predominant feature in iconic signs – however similarity is not a single kind of relationship. The relevance of similarities differs. Sometimes, but not always, perception of similarities is tightly coupled to the conception of a sign relation. Important in this presentation, is the point that via the sign relation one may gain insight into structurally different organizations of similarity relations. A concept of Iconic Attitude (Lenninger 2019) is presented and discussed as a Phenomenal outlook that responds to the qualities in the iconic ground and thus may “manifest” a visual generalization in a specific sign perception.Goodman, N. 1972. Seven strictures on similarity. In Problems and projects, 437–446. Indianapolis/New York: Bobbs-Merrill.Groupe µ (1992). Traité du signe visuel. Pour une rhétorique de l'image. Paris: Seuil.Medin, D. L, Goldstone, R. L., & Gentner, D. (1993). Respects for Similarity. Psychological Review, 100(2), 254-278.Lenninger, S. (2019). The metaphor and the iconic attitude. Cognitive Semiotics, 12(1).Sonesson, G. (1989). Pictorial Concepts: inquiries into the semiotic heritage and its relevance to the interpretation of the visual world. Lund University Press: Lund.Tversky. A. (1977). Features of similarity. Psychological Review, 84(4), 327-352.
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