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  • 1.
    Andersson, Linus
    et al.
    Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbets- och folkhälsovetenskap, Arbetshälsovetenskap. Högskolan i Gävle, Centrum för belastningsskadeforskning.
    Claeson, Anna-Sara
    Department of Psychology, Umeå University, Sweden.
    Sandberg, Petra
    Department of Psychology, Umeå University, Sweden.
    Highlighting the large variation in perceived properties of odors over time2017Inngår i: Chemical Senses, ISSN 0379-864X, E-ISSN 1464-3553, Vol. 42, nr 2, s. E26-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Individuals differ considerably when rating the perceived properties of odors, especially over time. A second glance at previously published data-sets from our laboratory revealed that the same invariant exposure often produced both floor and roof effects. An odor that at the end of the exposure ses-sion was regarded as non-existent by one participant, could border the “absoulte maximum” rating category in another. We provide re-analyses from four exposure studies where we illustrate the perceptual variability over time, and outcomes associated with such ratings. We note that high, compared with low ratings of odor intensity over time is associated with ratings of unpleasantness and symptoms, but also with everyday distress, cognitive performance, autonomous nerv-ous system activity and deviating responses in the so-called pain or saliency matrix of the brain. We bring an open ques-tion to ECRO regarding how this considerable variability should be interpreted, and what the consequenced are for research and for setting exposure limits.

  • 2.
    Andersson, Linus
    et al.
    Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbets- och folkhälsovetenskap, Arbetshälsovetenskap. Högskolan i Gävle, Centrum för belastningsskadeforskning. Department of Psychology, Umeå University, Umeå, Sweden.
    Sandberg, Petra
    Department of Psychology, Umeå University, Umeå, Sweden.
    Olofsson, Jonas K.
    Department of Psychology, Stockholm University, Stockholm, Sweden.
    Nordin, Steven
    Department of Psychology, Umeå University, Umeå, Sweden.
    Effects of Task Demands on Olfactory, Auditory, and Visual Event-Related Potentials Suggest Similar Top-Down Modulation Across Senses2018Inngår i: Chemical Senses, ISSN 0379-864X, E-ISSN 1464-3553, Vol. 43, nr 2, s. 129-134, artikkel-id bjx082Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A widely held view is that top-down modulation of sensory information relies on an amodal control network that acts through the thalamus to regulate incoming signals. Olfaction lacks a direct thalamic projection, which suggests that it may differ from other modalities in this regard. We investigated the late positive complex (LPC) amplitudes of event-related potentials (ERP) from 28 participants, elicited by intensity-matched olfactory, auditory and visual stimuli, during a condition of focused attention, a neutral condition, and a condition in which stimuli were to be actively ignored. Amplitudes were largest during the attend condition, lowest during the ignore condition, with the neutral condition in between. A Bayesian analysis resulted in strong evidence for similar effects of task across sensory modalities. We conclude that olfaction, despite its unique neural projections, does not differ from audition and vision in terms of task-dependent neural modulation of the LPC.

  • 3.
    Cornell Kärnekull, Stina
    et al.
    Stockholms Universitet.
    Jonsson, Fredrik U.
    Stockholms Universitet.
    Willander, Johan
    Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för socialt arbete och psykologi, Psykologi.
    Larsson, Maria
    Stockholms Universitet.
    Context independent memory for odors and words2015Inngår i: Chemical Senses, ISSN 0379-864X, E-ISSN 1464-3553, Vol. 40, nr 3, s. 240-240Artikkel i tidsskrift (Annet vitenskapelig)
  • 4.
    Cornell Kärnekull, Stina
    et al.
    Gösta Ekman Laboratory, Department of Psychology, Stockholm University, Stockholm, Sweden.
    Jönsson, Fredrik U.
    Department of Psychology, Stockholm University, Stockholm, Sweden.
    Willander, Johan
    Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för socialt arbete och psykologi, Psykologi. Gösta Ekman Laboratory, Department of Psychology, Stockholm University, Stockholm, Sweden.
    Sikström, Sverker
    Department of Psychology, Lund University, Lund, Sweden.
    Larsson, Maria
    Gösta Ekman Laboratory, Department of Psychology, Stockholm University, Stockholm, Sweden.
    Long-term memory for odors: influences of familiarity and identification across 64 days2015Inngår i: Chemical Senses, ISSN 0379-864X, E-ISSN 1464-3553, Vol. 40, nr 4, s. 259-267Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Few studies have investigated long-term odor recognition memory, although some early observations suggested that the forgetting rate of olfactory representations is slower than for other sensory modalities. This study investigated recognition memory across 64 days for high and low familiar odors and faces. Memory was assessed in 83 young participants at 4 occasions; immediate, 4, 16, and 64 days after encoding. The results indicated significant forgetting for odors and faces across the 64 days. The forgetting functions for the 2 modalities were not fundamentally different. Moreover, high familiar odors and faces were better remembered than low familiar ones, indicating an important role of semantic knowledge on recognition proficiency for both modalities. Although odor recognition was significantly better than chance at the 64 days testing, memory for the low familiar odors was relatively poor. Also, the results indicated that odor identification consistency across sessions, irrespective of accuracy, was positively related to successful recognition.

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