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  • 1.
    Bergström, Sten Sture
    University of Gävle, Belastningsskadecentrum.
    The AMBEGUJAS phenomenon and colour constancy2004In: Perception, ISSN 0301-0066, E-ISSN 1468-4233, Vol. 33, no 7, p. 831-835Article in journal (Refereed)
    Abstract [en]

    The AMBEGUJAS phenomenon is a reversible flat figure that is spontaneously shifting between two apparent 3-0 shapes-'tile' and 'roor. 2-0 perceptions have very rarely been reported. Tied to the shifts between the tile and roof shapes are remarkable changes of perceived colour. In our example, the tile appears to have orange (top half) and blue-green (bottom half) surface colours in white light. The roof appears grey but in an orange illumination and with a blue -green shadow. This phenomenon appears whether a grey display is presented in two coloured illuminations, or a chromatic display with two surface colours (orange and blue -green) is presented in white light. In the coloured illuminations the tile is an example of non-constancy, since its colours are non-veridical colour perceptions. The centre stripe of the display appears to have the same orange and blue -green colours as the lateral stripes but in a shadow. This seems like a colour constancy in a non-constancy situation. An alternative to the classical definition of colour constancy is discussed.

  • 2.
    Bergström, Sten Sture
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. Department of Psychology, Umeå University.
    Gustafsson, Karl-Arne
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. Department of Psychology, Umeå University.
    Concave and convex phases in ambiguous figures showing colour shifts: Mach's figure and the AMBEGUJAS phenomenon2011In: Perception, ISSN 0301-0066, E-ISSN 1468-4233, Vol. 40, no 1, p. 30-38Article in journal (Refereed)
    Abstract [en]

    Two ambiguous figures (Mach's book-figure and the AMBEGUJAS phenomenon) have been studied. They show colour shifts synchronised with the shifts of their alternative phases. The perceived concave phase appeared to have chromatic surface colour, but the perceived convex phase can appear to be in coloured illumination and shadow (film colour). The two perceived reversible shapes of the Mach figure (the book and the tent) and the three perceived alternative shapes of the Mondrians used in the AMBEGUJAS phenomenon (a roof, a ceiling, and a tile) all can appear to have chromatic surface colours in their concave phases but appear to have coloured illumination and shadow in their convex phases

  • 3.
    Nordin, Steven
    et al.
    Department of Psychology, Umeå University, Sweden.
    Aldrin, Lina
    Department of Psychology, Umeå University, Sweden.
    Claeson, Anna-Sara
    Department of Psychology, Umeå University, Sweden.
    Andersson, Linus
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science. University of Gävle, Centre for Musculoskeletal Research. Department of Psychology, Umeå University, Umeå, Sweden.
    Effects of negative affectivity and odor valence on chemosensory and symptom perception and perceived ability to focus on a cognitive task2017In: Perception, ISSN 0301-0066, E-ISSN 1468-4233, Vol. 46, no 3-4, p. 431-446Article in journal (Refereed)
    Abstract [en]

    The aim was to gain understanding for the impact of negative affectivity (NA) and odor valanceon perceptual aspects during low-level odorous exposure. Fifty-five young adults who were eitherrelatively low or high in NA (anxiety, depression, and somatization) were randomized forexposure to either limonene (pleasant odor) or pyridine (unpleasant odor). In an exposurechamber, they took part in baseline, blank and stable exposure sessions, during which theyrated odor intensity, impact on ability to focus on an imagined cognitive task, and intensity ofsymptoms. The results showed higher ratings of negative impact on ability to focus duringexposure to the unpleasant odor compared with the pleasant odor, and an association betweenNA and symptom intensity, with 18% of the variance in symptom intensity explainedby somatization. The association between NA and symptom intensity was found to be drivenby the factor sex. These results imply (a) that prior findings of odorous exposure that interferenegatively with work performance may be due to impact of an unpleasant odor on ability to focuson cognitive tasks and (b) that there are associations between NA, sex, and symptoms that maypartly be referred to attentiveness to and interpretation of bodily sensations.

  • 4.
    Raudsepp, Jaanus
    et al.
    University of Gävle, Belastningsskadecentrum.
    Djupsjöbacka, Mats
    University of Gävle, Belastningsskadecentrum.
    Handgrip maximum force and the visual horizontal-vertical illusion.2005In: Perception, ISSN 0301-0066, E-ISSN 1468-4233, Vol. 34, no 4, p. 421-8Article in journal (Refereed)
    Abstract [en]

    The visual horizontal-vertical illusion (HVI) refers to the tendency to overestimate vertical distances relative to horizontals in both 2-D and 3-D presentations. Although the HVI is evident across a wide range of different stimuli, no general theoretical account fully explains the illusion. Some recent authors have proposed the 'effort' account of HVI, contending that vertical overestimation is mediated by effort assessment of gravitational challenges offered by the stimulus. The theory has been supported by a set of studies showing that the height overestimation of large-scale 3-D objects is inversely related to perceivers' fitness and strength. We explored if the large-scale HVI/strength dependence extends to the evaluation of small-scale 2-D line stimuli, traditionally used in HVI studies. We measured the maximum handgrip strength, and assessed the HVI with a computerised line-adjustment task in thirty-two individuals. Compatible with earlier findings in the context of large-scale 3-D stimuli, a significant negative correlation was found between the strength of the dominant hand and amount of HVI. In addition, the variability of HVI was negatively correlated with maximum grip strength of both hands. The results are discussed with reference to the 'effort' account of HVI.

  • 5.
    Richter, Hans O.
    et al.
    University of Gävle, Centre for Musculoskeletal Research.
    Bänziger, Tanja
    Abdi, S.
    Forsman, Mikael
    Low-level sustained accommodative/vergence loads, eyestrain and trapezius muscle activity2008In: Perception, ISSN 0301-0066, E-ISSN 1468-4233, Vol. 37, no Suppl., p. 24-24Article in journal (Refereed)
  • 6.
    Richter, Hans O.
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.
    Röijezon, Ulrik
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.
    Björklund, Martin
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.
    Djupsjöbacka, Mats
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.
    Long-term adaptation to neck/shoulder pain and perceptual performance in a hand laterality motor imagery test2010In: Perception, ISSN 0301-0066, E-ISSN 1468-4233, Vol. 39, no 1, p. 119-130Article in journal (Refereed)
    Abstract [en]

    The effect of neck/shoulder pain on the performance in a hand laterality motor imagery test was studied. Responses to the Cooper and Shepard (1975, Journal of Experimental Psychology: Human Perception and Performance 104 48 ^ 56) hand laterality test were explored in twenty-four individuals with chronic non-specific neck pain and twenty-one subjects with chronic neck pain of traumatic origin (whiplash-associated disorder). Twenty-two controls were also included in the study. Digitalised right- or left-hand stimuli were presented at five different stimulus angles (08, 458 laterally, 908 laterally, 1358 laterally, and 1808). The experimental task was to decide the laterality as fast and accurately as possible. The performance, both reaction time (RT) and accuracy, of the two experimental groups was contrasted with that of the control group. The main results revealed that the subjects afflicted with whiplash injury on the average exhibited a faster response pattern than symptom-free healthy controls. Despite their  usculoskeletal deficits and experience of pain these volunteers also exhibited a preserved speed ^ accuracy tradeoff. Longer duration of time with symptoms of neck pain was, moreover, associated with progressively faster RTs. These results point to perceptual learning and may reflect different stages of adaptation to neck pain.

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