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Lennart HögmanUniversitetslektor



I urval från Stockholms universitets publikationsdatabas

  • Physiological correlates of the flow experience during computer game playing

    2015. Laszlo Harmat (et al.). International Journal of Psychophysiology 97 (1), 1-7


    Flow is the subjective experience of effortless attention, reduced self-awareness, and enjoyment that typically occurs during optimal task performance. Previous studies have suggested that flow may be associated with a non-reciprocal coactivation of the sympathetic and parasympathetic systems and, on a cortical level, with a state of hypofrontality and implicit processing. Here, we test these hypotheses, using the computer game TETRIS as model task. The participants (n = 77) played TETRIS under three conditions that differed in difficulty (Easy < Optimal < Difficult). Cardiac and respiratory activities, and the average oxygenation changes of the prefrontal cortex were measured continuously with functional near infrared spectroscopy (INIRS) during performance. The Optimal condition was characterized by the highest levels of state flow, positive affect, and effortless attention. The associations between self-reported psychological flow and physiological measures were investigated using a series of repeated measures linear mixed model analyses. The results showed that higher flow was associated with larger respiratory depth and lower LF. The higher respiratory depth during high flow is indicative of a more relaxed state with an increased parasympathetic activity, and thus provides partial support for the main hypotheses. There was no association between frontal cortical oxygenation and flow, even at liberal thresholds; i.e. we found no support that flow is related to a state of hypofrontality.

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  • Viewing distance matter to perceived intensity of facial expressions

    2015. Andreas Gerhardsson, Lennart Högman, Håkan Fischer. Frontiers in Psychology 6


    In our daily perception of facial expressions, we depend on an ability to generalize across the varied distances at which they may appear. This is important to how we interpret the quality and the intensity of the expression. Previous research has not investigated whether this so called perceptual constancy also applies to the experienced intensity of facial expressions. Using a psychophysical measure (Borg CR100 scale) the present study aimed to further investigate perceptual constancy of happy and angry facial expressions at varied sizes, which is a proxy for varying viewing distances. Seventy-one (42 females) participants rated the intensity and valence of facial expressions varying in distance and intensity. The results demonstrated that the perceived intensity (PI) of the emotional facial expression was dependent on the distance of the face and the person perceiving it. An interaction effect was noted, indicating that close-up faces are perceived as more intense than faces at a distance and that this effect is stronger the more intense the facial expression truly is. The present study raises considerations regarding constancy of the PI of happy and angry facial expressions at varied distances.

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