Publications by authors named "Ragnar Olafsson"

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Prevalence of seasonal affective disorder and seasonality of mood and behaviour in Iceland - Methodological implications for revisiting the latitude hypothesis.
Lada Zelinski, Ara Dan Pálmadóttir, Ásta Guðrún Birgisdóttir, Leon Daði Sesseljuson, Ragnar Pétur Ólafsson

J Affect Disord· December 2025

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Safety Threats of Seasonal and Non-Seasonal Natural Disasters Increase Disaster Anxiety and Disaster Risk Perception.
Ásta Guðrún Birgisdóttir, Lada Zelinski, Ragnar P Ólafsson, Yvonne Höller

Scand J Psychol· September 2025

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Can Self-Reported Seasonality Predict Prospectively Assessed Seasonal Changes of Self-Reported Mood, Food Cravings, Body Weight, Insomnia, and Physical Activity?
Jonas Potthoff, Ragnar Pétur Ólafsson, Lada Zelinski, Yvonne Höller

Scand J Psychol· August 2025

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[Psychedelics and treatment of mental disorders: A survey of attitudes and knowledge among psychiatrists, general practitioners and psychologists in Iceland].
Ragnar P Olafsson, Karol Kvaran, Kristin Ketilsdottir, Kolbrun Hallgrimsdottir, Emil L Sigurdsson

Laeknabladid· November 2023

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EEG-responses to mood induction interact with seasonality and age.
Yvonne Höller, Sara Teresa Jónsdóttir, Anna Hjálmveig Hannesdóttir, Ragnar Pétur Ólafsson

Front Psychiatry· August 2022

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Automaticity and depression: Daily mood-reactive rumination in people with and without depression history.
Kristján Helgi Hjartarson, Ivar Snorrason, Laura F Bringmann, Ragnar P Ólafsson

J Psychopathol Clin Sci· May 2022

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Do daily mood fluctuations activate ruminative thoughts as a mental habit? Results from an ecological momentary assessment study.
Kristján Helgi Hjartarson, Ivar Snorrason, Laura F Bringmann, Bjarni E Ögmundsson, Ragnar P Ólafsson

Behav Res Ther· May 2021

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A Test of the Habit-Goal Framework of Depressive Rumination and Its Relevance to Cognitive Reactivity.
Ragnar P Ólafsson, Sigfríð J Guðmundsdóttir, Tanja D Björnsdóttir, Ivar Snorrason

Behav Ther· May 2020

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Disentangling Reward Processing in Trichotillomania: 'Wanting' and 'Liking' Hair Pulling Have Distinct Clinical Correlates.
Ivar Snorrason, Emily J Ricketts, Ragnar P Olafsson, Michelle Rozenman, Christopher S Colwell

J Psychopathol Behav Assess· June 2019

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'Wanting' and 'liking' skin picking: A validation of the Skin Picking Reward Scale.
Ivar Snorrason, Ragnar P Olafsson, David C Houghton, Douglas W Woods, Han-Joo Lee

J Behav Addict· December 2015

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Replacing intrusive thoughts: investigating thought control in relation to OCD symptoms.
Ragnar P Ólafsson, Ívar Snorrason, Reynar K Bjarnason, Paul M G Emmelkamp, Daníel Þ Ólason

J Behav Ther Exp Psychiatry· December 2014

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[Patient satisfaction with care and interaction with staff in the Acute Cardiac Unit at Landspitali - The National University Hospital of Iceland].
Margrét Hlín Snorradóttir, Daviđ O Arnar, Ragnar F Ólafsson, Runólfur Pálsson, Ólafur Skúli Indriđason

Laeknabladid· July 2014

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The relationship between physical appearance concerns, disgust, and anti-fat prejudice.
Kerry S O'Brien, Sigrún Daníelsdóttir, Ragnar P Ólafsson, Ingunn Hansdóttir, Thorarna G Fridjónsdóttir

Body Image· September 2013

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Design considerations and performance of MEMS acoustoelectric ultrasound detectors.
Zhaohui Wang, Pier Ingram, Charles L Greenlee, Ragnar Olafsson, Robert A Norwood

IEEE Trans Ultrason Ferroelectr Freq Control· September 2013

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The Skin Picking Impact Scale: Factor structure, validity and development of a short version.
Ivar Snorrason, Ragnar P Olafsson, Christopher A Flessner, Nancy J Keuthen, Martin E Franklin

Scand J Psychol· August 2013

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Suppressing disgust related thoughts and performance on a subsequent behavioural avoidance task: implications for OCD.
Ragnar P Ólafsson, Paul M G Emmelkamp, Eva R Gunnarsdóttir, Torri Snæbjörnsson, Daníel T Ólason

Behav Res Ther· March 2013

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Real-time photoacoustic and ultrasound imaging: a simple solution for clinical ultrasound systems with linear arrays.
Leonardo G Montilla, Ragnar Olafsson, Daniel R Bauer, Russell S Witte

Phys Med Biol· January 2013

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Measuring the acoustoelectric interaction constant using ultrasound current source density imaging.
Qian Li, Ragnar Olafsson, Pier Ingram, Zhaohui Wang, Russell Witte

Phys Med Biol· October 2012

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Motor inhibition, reflection impulsivity, and trait impulsivity in pathological skin picking.
Ívar Snorrason, Jakob Smári, Ragnar P Ólafsson

Behav Ther· September 2011

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Self reported attentional control with the Attentional Control Scale: factor structure and relationship with symptoms of anxiety and depression.
Ragnar P Ólafsson, Jakob Smári, Fríður Guðmundsdóttir, Gunnhildur Olafsdóttir, Hrafnhildur L Harðardóttir

J Anxiety Disord· August 2011

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3-D photoacoustic and pulse echo imaging of prostate tumor progression in the mouse window chamber.
Daniel R Bauer, Ragnar Olafsson, Leonardo G Montilla, Russell S Witte

J Biomed Opt· February 2011

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Comparison of 2-D speckle tracking and tissue Doppler imaging in an isolated rabbit heart model.
Congxian Jia, Ragnar Olafsson, Sheng-Wen Huang, Theodore J Kolias, Kang Kim

IEEE Trans Ultrason Ferroelectr Freq Control· November 2010

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Emotion regulation in pathological skin picking: findings from a non-treatment seeking sample.
Ivar Snorrason, Jakob Smári, Ragnar P Olafsson

J Behav Ther Exp Psychiatry· September 2010

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Real-time, contrast enhanced photoacoustic imaging of cancer in a mouse window chamber.
Ragnar Olafsson, Daniel R Bauer, Leonardo G Montilla, Russell S Witte

Opt Express· August 2010

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