Espen Borgå Johansen

Summary

Affiliation: University of Oslo
Country: Norway

Publications

  1. pmc Behavioral variability, elimination of responses, and delay-of-reinforcement gradients in SHR and WKY rats
    Espen B Johansen
    Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
    Behav Brain Funct 3:60. 2007
  2. ncbi request reprint Slower extinction of responses maintained by intra-cranial self-stimulation (ICSS) in an animal model of attention-deficit/hyperactivity disorder (ADHD)
    Espen Borgå Johansen
    Department of Physiology, University of Oslo, Norway Centre for Advanced Study, P O Box 1103 Blindern, 0317 Oslo, Norway
    Behav Brain Res 162:22-31. 2005
  3. ncbi request reprint Behavioral effects of intra-cranial self-stimulation in an animal model of attention-deficit/hyperactivity disorder (ADHD)
    Espen Borgå Johansen
    Department of Physiology, University of Oslo, P O Box 1103, Blindern, 0317 Oslo, Norway
    Behav Brain Res 162:32-46. 2005
  4. ncbi request reprint Effects of delayed reinforcers on the behavior of an animal model of attention-deficit/hyperactivity disorder (ADHD)
    Espen Borgå Johansen
    Department of Physiology, University of Oslo, P O Box 1003, Blindern, N 0317 Oslo, Norway
    Behav Brain Res 162:47-61. 2005
  5. pmc Origins of altered reinforcement effects in ADHD
    Espen Borgå Johansen
    Centre for Advanced Study CAS at the Norwegian Academy for Science and Letters, Oslo, Norway
    Behav Brain Funct 5:7. 2009
  6. ncbi request reprint Response disinhibition may be explained as an extinction deficit in an animal model of attention-deficit/hyperactivity disorder (ADHD)
    Espen Borgå Johansen
    Department of Physiology, University of Oslo, P O Box 1103, Blindern, 0317 Oslo, Norway
    Behav Brain Res 149:183-96. 2004
  7. pmc The spontaneously hypertensive rat model of ADHD--the importance of selecting the appropriate reference strain
    Terje Sagvolden
    Institute of Basic Medical Sciences, University of Oslo, Norway
    Neuropharmacology 57:619-26. 2009
  8. ncbi request reprint Rodent models of attention-deficit/hyperactivity disorder
    Terje Sagvolden
    Center for Advanced Study at the Norwegian Academy of Science and Letters, Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
    Biol Psychiatry 57:1239-47. 2005
  9. pmc Postnatal exposure to PCB 153 and PCB 180, but not to PCB 52, produces changes in activity level and stimulus control in outbred male Wistar Kyoto rats
    Espen Borgå Johansen
    Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
    Behav Brain Funct 7:18. 2011
  10. doi request reprint Behavioral changes following PCB 153 exposure in the Spontaneously Hypertensive rat - an animal model of Attention-Deficit/Hyperactivity disorder
    Espen Borgå Johansen
    Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
    Behav Brain Funct 10:1. 2014

Detail Information

Publications14

  1. pmc Behavioral variability, elimination of responses, and delay-of-reinforcement gradients in SHR and WKY rats
    Espen B Johansen
    Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
    Behav Brain Funct 3:60. 2007
    ..abstract:..
  2. ncbi request reprint Slower extinction of responses maintained by intra-cranial self-stimulation (ICSS) in an animal model of attention-deficit/hyperactivity disorder (ADHD)
    Espen Borgå Johansen
    Department of Physiology, University of Oslo, Norway Centre for Advanced Study, P O Box 1103 Blindern, 0317 Oslo, Norway
    Behav Brain Res 162:22-31. 2005
    ..Slower extinction of previously reinforced behavior is suggested as an alternative explanation for the frequently observed increased behavioral output that has previously been interpreted as "disinhibition" of behavior in ADHD...
  3. ncbi request reprint Behavioral effects of intra-cranial self-stimulation in an animal model of attention-deficit/hyperactivity disorder (ADHD)
    Espen Borgå Johansen
    Department of Physiology, University of Oslo, P O Box 1103, Blindern, 0317 Oslo, Norway
    Behav Brain Res 162:32-46. 2005
    ..Overall, more responses with short inter-response times (IRT) were found in the SHR compared to the controls during intermittent reinforcement. The results are consistent with a steepened delay-of-reinforcement gradient in SHR...
  4. ncbi request reprint Effects of delayed reinforcers on the behavior of an animal model of attention-deficit/hyperactivity disorder (ADHD)
    Espen Borgå Johansen
    Department of Physiology, University of Oslo, P O Box 1003, Blindern, N 0317 Oslo, Norway
    Behav Brain Res 162:47-61. 2005
    ..In general, the results support predictions from the suggested steepened delay gradient in SHR. However, the predictions were only partly confirmed by the analyses of the decay parameter...
  5. pmc Origins of altered reinforcement effects in ADHD
    Espen Borgå Johansen
    Centre for Advanced Study CAS at the Norwegian Academy for Science and Letters, Oslo, Norway
    Behav Brain Funct 5:7. 2009
    ..Theoretical and experimental analyses of these moderating factors will help to determine just how reinforcement processes are altered in ADHD. Such analyses can only help to improve treatment strategies for ADHD...
  6. ncbi request reprint Response disinhibition may be explained as an extinction deficit in an animal model of attention-deficit/hyperactivity disorder (ADHD)
    Espen Borgå Johansen
    Department of Physiology, University of Oslo, P O Box 1103, Blindern, 0317 Oslo, Norway
    Behav Brain Res 149:183-96. 2004
    ..The extinction deficit in the SHR may be linked to reinforcer unpredictability and the presence of conditioned reinforcers, and may explain response disinhibition seen in children with ADHD...
  7. pmc The spontaneously hypertensive rat model of ADHD--the importance of selecting the appropriate reference strain
    Terje Sagvolden
    Institute of Basic Medical Sciences, University of Oslo, Norway
    Neuropharmacology 57:619-26. 2009
    ..Finally, we argue that WKY rats obtained from Charles River, Germany (WKY/NCrl) provide a promising model for the predominantly inattentive subtype of ADHD (ADHD-PI); in this case also the WKY/NHsd substrain should be used as control...
  8. ncbi request reprint Rodent models of attention-deficit/hyperactivity disorder
    Terje Sagvolden
    Center for Advanced Study at the Norwegian Academy of Science and Letters, Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
    Biol Psychiatry 57:1239-47. 2005
    ....
  9. pmc Postnatal exposure to PCB 153 and PCB 180, but not to PCB 52, produces changes in activity level and stimulus control in outbred male Wistar Kyoto rats
    Espen Borgå Johansen
    Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
    Behav Brain Funct 7:18. 2011
    ..67 s), and responses with short IRTs (< 0.67 s)...
  10. doi request reprint Behavioral changes following PCB 153 exposure in the Spontaneously Hypertensive rat - an animal model of Attention-Deficit/Hyperactivity disorder
    Espen Borgå Johansen
    Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
    Behav Brain Funct 10:1. 2014
    ..The present study examined the relation between exposure to PCB 153 and changes in ADHD-like behavior in an animal model of ADHD, the spontaneously hypertensive rats (SHR/NCrl), and in Wistar Kyoto (WKY/NHsd) controls...
  11. pmc Marine Ο-3 polyunsaturated fatty acids induce sex-specific changes in reinforcer-controlled behaviour and neurotransmitter metabolism in a spontaneously hypertensive rat model of ADHD
    Kine S Dervola
    Department of Biochemistry, Institute of Basic Medical Science, Faculty of Medicine, University of Oslo, Oslo, Norway
    Behav Brain Funct 8:56. 2012
    ..Previous reports suggest that omega-3 (n-3) polyunsaturated fatty acids (PUFA) supplements may reduce ADHD-like behaviour. Our aim was to investigate potential effects of n-3 PUFA supplementation in an animal model of ADHD...
  12. ncbi request reprint Attention-deficit/hyperactivity disorder (ADHD) behaviour explained by dysfunctioning reinforcement and extinction processes
    Espen Borgå Johansen
    Department of Physiology, University of Oslo, PO Box 1103 Blindern, N 0317 Oslo, Norway
    Behav Brain Res 130:37-45. 2002
    ..Etiologically, dopamine dysfunctioning will probably mainly be genetically determined while sometimes be induced by environmental factors like drugs of abuse or pollutants, which may explain geographical differences in prevalence rates...
  13. ncbi request reprint A dynamic developmental theory of attention-deficit/hyperactivity disorder (ADHD) predominantly hyperactive/impulsive and combined subtypes
    Terje Sagvolden
    Department of Physiology, University of Oslo, NO 0317 Oslo, Norway
    Behav Brain Sci 28:397-419; discussion 419-68. 2005
    ..The theory describes how individual predispositions interact with these conditions to produce behavioral, emotional, and cognitive effects that can turn into relatively stable behavioral patterns...
  14. doi request reprint Rat models of ADHD
    Terje Sagvolden
    Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, NO 0317, Oslo, Norway
    Curr Top Behav Neurosci 9:301-15. 2012
    ..Finally, model data yield support to independent hyperactivity and inattention dimensions in ADHD behavior...