Katja Valli

Individual and Situational Predictors of Threatening Dream Content During the COVID-19 Pandemic

Ville Loukola, Jarno Tuominen, Eveliina Malinen, Katariina Tienhaara, Henri Olkoniemi, Antti Revonsuo, Katja Valli

Journal of Sleep Research

2026. Article. https://doi.org/10.1111/jsr.70336 Open Access

A consensus taxonomy of altered (nonordinary) states of consciousness: Bringing order to disarray

Etzel Cardeña, Aviva Berkovich-Ohana, Katja Valli, Pablo Barttfeld, Alex Gomez-Marin, Bruce Greyson, V. K. Kumar, Steven Laureys, Tanya Marie Luhrmann, Andrew Newberg, Katrin H. Preller, Frank W. Putnam, Enzo Tagliazucchi, Roger Walsh, Olivia Carter et al.

Psychology of Consciousness

2025. Article. https://doi.org/10.1037/cns0000431 Open Access

State anxiety is associated with hormonal, cardiovascular, and sleep parameters in Finnish postmenopausal women

Ville Rimpilä, Tero Vahlberg, Katja Valli, Tarja Saaresranta

Maturitas

2025. Article. https://doi.org/10.1016/j.maturitas.2025.108266 Open Access

The relationship of bispectral index values to conscious state: an analysis of two volunteer cohort studies

Jordan J. Wehrman, Peter J. Schuller, Cameron P. Casey, Annalotta Scheinin, Roosa E. Kallionpää, Katja Valli, Antti Revonsuo, Oskari Kantonen, Sean Tanabe, William Filbey, Robert A. Pearce, Jamie W. Sleigh, Harry Scheinin, Robert D. Sanders

British Journal of Anaesthesia

2025. Article. https://doi.org/10.1016/j.bja.2024.09.032

A dream EEG and mentation database

William Wong, Rubén Herzog, Kátia Cristine Andrade, Thomas Andrillon, Draulio Barros de Araujo, Isabelle Arnulf, Somayeh Ataei, Giulia Avvenuti, Benjamin Baird, Michele Bellesi, Damiana Bergamo, Giulio Bernardi, Mark Blagrove, Nicolas Decat, Çağatay Demirel et al.

Nature Communications

2025. Article. https://doi.org/10.1038/s41467-025-61945-1 Open Access

Viral simulations in dreams: The effect of the COVID-19 pandemic on threatening dream content in a Finnish sample of diary dreams

Ville Loukola, Jarno Tuominen, Santeri Kirsilä, Annimaaria Kyyhkynen, Maron Lahdenperä, Lilja Parkkali, Emilia Ranta, Eveliina Malinen, Sanni Vanhanen, Katariina Välimaa, Henri Olkoniemi, Antti Revonsuo, Katja Valli

Consciousness and Cognition

2024. Article. https://doi.org/10.1016/j.concog.2024.103651 Open Access

Nightmares share genetic risk factors with sleep and psychiatric traits

Hanna M. Ollila, Nasa Sinnott-Armstrong, Katri Kantojärvi, Martin Broberg, Teemu Palviainen, Samuel Jones, Vili Ripatti, Anita Pandit, Robin Rong, Kati Kristiansson, Nils Sandman, Katja Valli, Christer Hublin, Samuli Ripatti, Elisabeth Widen et al.

Translational Psychiatry

2024. Article. https://doi.org/10.1038/s41398-023-02637-6 Open Access

Morning tiredness and insomnia symptoms are associated with increased blood pressure in midlife women

Ville Rimpilä, Katja Valli, Tero Vahlberg, Tarja Saaresranta

Maturitas

2024. Article. https://doi.org/10.1016/j.maturitas.2024.108131 Open Access

COVID-19 on mind: Daily worry about the coronavirus is linked to negative affect experienced during mind-wandering and dreaming

Pilleriin Sikka, Jarno Tuominen, Alejandro Ezquerro Nassar, Manuela Kirberg, Ville Loukola, Antti Revonsuo, Katja Valli, Jennifer Windt, Tristan A. Bekinschtein, Valdas Noreika

Emotion

2024. Article. https://doi.org/10.1037/emo0001255 Open Access

Dream function and dream amnesia: Dissolution of an apparent paradox

Jialin Zhao, Sarah F. Schoch, Katja Valli, Martin Dresler

Neuroscience and Biobehavioral Reviews

2024. Article. https://doi.org/10.1016/j.neubiorev.2024.105951

Dangerous Waters: The Impact of the 2004 Indian Ocean Tsunami on Survivor Dream Content

Monica Bergman, Oskar MacGregor, Henri Olkoniemi, Rickard Redgård, Antti Revonsuo, Katja Valli

Dreaming (New York, N.Y.)

2023. Article. https://doi.org/10.1037/drm0000254

Decreased Thalamic Activity Is a Correlate for Disconnectedness during Anesthesia with Propofol, Dexmedetomidine and Sevoflurane But Not S-Ketamine

Oskari Kantonen, Lauri Laaksonen, Michael Alkire, Annalotta Scheinin, Jaakko Långsjö, Roosa E. Kallionpää, Kaike Kaisti, Linda Radek, Jarkko Johansson, Timo Laitio, Anu Maksimow, Joonas Scheinin, Mikko Nyman, Mika Scheinin, Olof Solin et al.

Journal of Neuroscience

2023. Article. https://doi.org/10.1523/jneurosci.2339-22.2023 Open Access

Subjective experiences during dexmedetomidine- or propofol-induced unresponsiveness and non-rapid eye movement sleep in healthy male subjects

Katja Valli, Linda Radek, Roosa E. Kallionpää, Annalotta Scheinin, Jaakko Långsjö, Kaike Kaisti, Oskari Kantonen, Jarno Korhonen, Tero Vahlberg, Antti Revonsuo, Harry Scheinin

British Journal of Anaesthesia

2023. Article. https://doi.org/10.1016/j.bja.2023.04.026 Open Access

Effects of dexmedetomidine, propofol, sevoflurane and S-ketamine on the human metabolome: A randomised trial using nuclear magnetic resonance spectroscopy

Aleksi J. Nummela, Lauri T. Laaksonen, Timo T. Laitio, Roosa E. Kallionpää, Jaakko W. Långsjö, Joonas M. Scheinin, Tero J. Vahlberg, Harri T. Koskela, Viljami Aittomäki, Katja J. Valli, Antti Revonsuo, Mikko Niemi, Markus Perola, Harry Scheinin

European Journal of Anaesthesiology

2022. Article. https://doi.org/10.1097/EJA.0000000000001591 Open Access

Circulating oxylipin and bile acid profiles of dexmedetomidine, propofol, sevoflurane, and S-ketamine: a randomised controlled trial using tandem mass spectrometry

Aleksi Nummela, Lauri Laaksonen, Annalotta Scheinin, Kaike Kaisti, Tero Vahlberg, Mikko Neuvonen, Katja Valli, Antti Revonsuo, Markus Perola, Mikko Niemi, Harry Scheinin, Timo Laitio

BJA Open

2022. Article. https://doi.org/10.1016/j.bjao.2022.100114 Open Access

‘No Man is an Island’: Effects of social seclusion on social dream content and REM sleep

Jarno Tuominen, Henri Olkoniemi, Antti Revonsuo, Katja Valli

British Journal of Psychology

2022. Article. https://doi.org/10.1111/bjop.12515 Open Access

Dream Sharing and the Enhancement of Empathy: Theoretical and Applied Implications

Mark Blagrove, Julia Lockheart, Michelle Carr, Shanice Basra, Harriet Graham, Hannah Lewis, Emily Murphy, Ausrine Sakalauskaite, Caitlin Trotman, Katja Valli

Dreaming (New York, N.Y.)

2021. Article. https://doi.org/10.1037/drm0000165

On no man's land: Subjective experiences during unresponsive and responsive sedative states induced by four different anesthetic agents

Linda Radek, Lauri Koskinen, Nils Sandman, Lauri Laaksonen, Roosa E. Kallionpää, Annalotta Scheinin, Ville Rajala, Anu Maksimow, Timo Laitio, Antti Revonsuo, Harry Scheinin, Katja Valli

Consciousness and Cognition

2021. Article. https://doi.org/10.1016/j.concog.2021.103239 Open Access

Foundations of human consciousness: Imaging the twilight zone

Annalotta Scheinin, Oskari Kantonen, Michael Alkire, Jaakko Långsjö, Roosa E. Kallionpää, Kaike Kaisti, Linda Radek, Jarkko Johansson, Nils Sandman, Mikko Nyman, Mika Scheinin, Tero Vahlberg, Antti Revonsuo, Katja Valli, Harry Scheinin

Journal of Neuroscience

2021. Article. https://doi.org/10.1523/JNEUROSCI.0775-20.2020 Open Access

Nightmare Distress Questionnaire: associated factors

Michael Schredl, Finnja Schramm, Katja Valli, Erik M. Mueller, Nils Sandman

Journal of Clinical Sleep Medicine (JCSM)

2021. Article. https://doi.org/10.5664/jcsm.8824

The dynamics of affect across the wake-sleep cycle: From waking mind-wandering to night-time dreaming

Pilleriin Sikka, Katja Valli, Antti Revonsuo, Jarno Tuominen

Consciousness and Cognition

2021. Article. https://doi.org/10.1016/j.concog.2021.103189 Open Access

The Holocaust as a Lifelong Nightmare: Posttraumatic Symptoms and Dream Content in Polish Auschwitz Survivors 30 Years After World War II

Monica Bergman, Oskar MacGregor, Henri Olkoniemi, Wojciech Owczarski, Antti Revonsuo, Katja Valli

American Journal of Psychology

2020. Article. https://doi.org/10.5406/amerjpsyc.133.2.0143

Alpha band frontal connectivity is a state-specific electroencephalographic correlate of unresponsiveness during exposure to dexmedetomidine and propofol

Roosa E. Kallionpää, Katja Valli, Annalotta Scheinin, Jaakko Långsjö, Anu Maksimow, Tero Vahlberg, Antti Revonsuo, Harry Scheinin, George A. Mashour, Duan Li

British Journal of Anaesthesia

2020. Article. https://doi.org/10.1016/j.bja.2020.05.068 Open Access

Modulating dream experience: Noninvasive brain stimulation over the sensorimotor cortex reduces dream movement

Valdas Noreika, Jennifer M. Windt, Markus Kern, Katja Valli, Tiina Salonen, Riitta Parkkola, Antti Revonsuo, Ahmed A. Karim, Tonio Ball, Bigna Lenggenhager

Scientific Reports

2020. Article. https://doi.org/10.1038/s41598-020-63479-6 Open Access

Dreams and nightmares in healthy adults and in patients with sleep and neurological disorders

Francesca Siclari, Katja Valli, Isabelle Arnulf

Lancet Neurology

2020. Article, review. https://doi.org/10.1016/S1474-4422(20)30275-1

Dreaming and Parasomnias in Narcolepsy

Katja Valli, Juha Markkula, Salla Lamusuo

Parasomnia Dreaming: Exploring Other Forms of Sleep Consciousness

2020. Chapter in book.

The Dream Catcher experiment: blinded analyses failed to detect markers of dreaming consciousness in EEG spectral power

William Wong, Valdas Noreika, Levente Móró, Antti Revonsuo, Jennifer Windt, Katja Valli, Naotsugu Tsuchiya

Neuroscience of Consciousness

2020. Article. https://doi.org/10.1093/nc/niaa006 Open Access

Testing the Empathy Theory of Dreaming: The Relationships Between Dream Sharing and Trait and State Empathy

Mark Blagrove, Sioned Hale, Julia Lockheart, Michelle Carr, Alex Jones, Katja Valli

Frontiers in Psychology

2019. Article. https://doi.org/10.3389/fpsyg.2019.01351 Open Access

Visual features and perceptual context modulate attention towards evolutionarily relevant threatening stimuli: Electrophysiological evidence

Simone Grassini, Henry Railo, Katja Valli, Antti Revonsuo, Mika Koivisto

Emotion

2019. Article. https://doi.org/10.1037/emo0000434

Pattern matters: Snakes exhibiting triangular and diamond-shaped skin patterns modulate electrophysiological activity in human visual cortex

Simone Grassini, Katja Valli, Jérémie Souchet, Fabien Aubret, Giulia V. Segurini, Antti Revonsuo, Mika Koivisto

Neuropsychologia

2019. Article. https://doi.org/10.1016/j.neuropsychologia.2019.05.024

The influence of dexmedetomidine and propofol on circulating cytokine levels in healthy subjects

Minna Kallioinen, Annalotta Scheinin, Mikael Maksimow, Jaakko Långsjö, Kaike Kaisti, Riikka Takala, Tero Vahlberg, Katja Valli, Marko Salmi, Harry Scheinin, Anu Maksimow

BMC Anesthesiology

2019. Article. https://doi.org/10.1186/s12871-019-0895-3 Open Access

Single-subject analysis of N400 event-related potential component with five different methods

Roosa E. Kallionpää, Henri Pesonen, Annalotta Scheinin, Nils Sandman, Ruut Laitio, Harry Scheinin, Antti Revonsuo, Katja Valli

International Journal of Psychophysiology

2019. Article. https://doi.org/10.1016/j.ijpsycho.2019.06.012 Open Access

EEG Frontal Alpha Asymmetry and Dream Affect: Alpha Oscillations Over the Right Frontal Cortex During REM Sleep and Pre-Sleep Wakefulness Predict Anger in REM Sleep Dreams

Pilleriin Sikka, Antti Revonsuo, Valdas Noreika, Katja Valli

Journal of Neuroscience

2019. Article. https://doi.org/10.1523/JNEUROSCI.2884-18.2019

Sleep Parameter Assessment Accuracy of a Consumer Home Sleep Monitoring Ballistocardiograph Beddit Sleep Tracker: A Validation Study

Jarno Tuominen, Karoliina Peltola, Tarja Saaresranta, Katja Valli

Journal of Clinical Sleep Medicine (JCSM)

2019. Article. https://doi.org/10.5664/jcsm.7682

The Social Simulation Theory

Jarno Tuominen, Antti Revonsuo, Katja Valli

Dreams: Understanding Biology, Psychology, and Culture: Volume 1

2019. Chapter in book.

Social contents in dreams: An empirical test of the Social Simulation Theory

Jarno Tuominen, Tuula Stenberg, Antti Revonsuo, Katja Valli

Consciousness and Cognition

2019. Article. https://doi.org/10.1016/j.concog.2019.01.017

Predictive Coding and Protoconsciousness

Jarno Tuominen, Katja Valli

Dreams: Understanding Biology, Psychology, and Culture: Volume 1

2019. Chapter in book.

Dreams: Understanding Biology, Psychology, and Culture: Volume 1

Katja Valli, Robert J. Hoss

2019. Editor (collection).

The Content of Dreams

Katja Valli, Robert J. Hoss

Dreams: Understanding Biology, Psychology, and Culture: Volume 1

2019. Chapter in book.

The Threat Simulation Theory

Katja Valli, Antti Revonsuo

Dreams: Understanding Biology, Psychology, and Culture: Volume 1

2019. Chapter in book.

Dreams as Self-Simulation and World Simulation

Jennifer M. Windt, Katja Valli

Dreams: Understanding Biology, Psychology, and Culture: Volume 1

2019. Chapter in book.

Spoken words are processed during dexmedetomidine-induced unresponsiveness

R. E. Kallionpää, A. Scheinin, R. A. Kallionpää, N. Sandman, M. Kallioinen, R. Laitio, T. Laitio, K. Kaskinoro, T. Kuusela, Antti Revonsuo, H. Scheinin, Katja Valli

British Journal of Anaesthesia

2018. Article. https://doi.org/10.1016/j.bja.2018.04.032 Open Access

Comparative effects of dexmedetomidine, propofol, sevoflurane, and S-ketamine on regional cerebral glucose metabolism in humans: a positron emission tomography study

L. Laaksonen, M. Kallioinen, J. Långsjö, T. Laitio, A. Scheinin, J. Scheinin, K. Kaisti, A. Maksimow, R. E. Kallionpää, V. Rajala, J. Johansson, O. Kantonen, M. Nyman, S. Sirén, Katja Valli et al.

British Journal of Anaesthesia

2018. Article. https://doi.org/10.1016/j.bja.2018.04.008 Open Access

Dreaming and awareness during dexmedetomidine- and propofol-induced unresponsiveness

L. Radek, R. E. Kallionpää, M. Karvonen, A. Scheinin, A. Maksimow, J. Långsjö, K. Kaisti, T. Vahlberg, Antti Revonsuo, H. Scheinin, Katja Valli

British Journal of Anaesthesia

2018. Article. https://doi.org/10.1016/j.bja.2018.03.014 Open Access

Differentiating Drug-related and State-related Effects of Dexmedetomidine and Propofol on the Electroencephalogram

Annalotta Scheinin, Roosa E. Kallionpää, Duan Li, Minna Kallioinen, Kaike Kaisti, Jaakko Långsjö, Anu Maksimow, Tero Vahlberg, Katja Valli, George A. Mashour, Antti Revonsuo, Harry Scheinin

Anesthesiology

2018. Article. https://doi.org/10.1097/ALN.0000000000002192

Dream emotions: a comparison of home dream reports with laboratory early and late REM dream reports

Pilleriin Sikka, Antti Revonsuo, Nils Sandman, Jarno Tuominen, Katja Valli

Journal of Sleep Research

2018. Article. https://doi.org/10.1111/jsr.12555 Open Access

Nightmares as predictors of suicide: an extension study including war veterans

Nils Sandman, Katja Valli, Erkki Kronholm, Erkki Vartiainen, Tiina Laatikainen, Tiina Paunio

Scientific Reports

2017. Article. https://doi.org/10.1038/srep44756 Open Access

How You Measure Is What You Get: Differences in Self- and External Ratings of Emotional Experiences in Home Dreams

Pilleriin Sikka, Diana Feilhauer, Katja Valli, Antti Revonsuo

American Journal of Psychology

2017. Article. https://doi.org/10.5406/amerjpsyc.130.3.0367

The Avatars in the Machine: Dreaming as a Simulation of Social Reality

Antti Revonsuo, Jarno Tuominen, Katja Valli

Open MIND: Philosophy and the Mind Sciences in the 21st Century

2016. Chapter in book. https://doi.org/10.15502/9783958570375 Open Access

The Simulation Theories of Dreaming: How to Make Theoretical Progress in Dream Science

Antti Revonsuo, Jarno Tuominen, Katja Valli

Open MIND: Philosophy and the Mind Sciences in the 21st Century

2016. Chapter in book. https://doi.org/10.15502/9783958570894 Open Access

Winter is coming: nightmares and sleep problems during seasonal affective disorder

Nils Sandman, Ilona Merikanto, Hanna Määttänen, Katja Valli, Erkki Kronholm, Tiina Laatikainen, Timo Partonen, Tiina Paunio

Journal of Sleep Research

2016. Article. https://doi.org/10.1111/jsr.12416 Open Access

Methodological Issues in Measuring Dream Emotions

Pilleriin Sikka, Antti Revonsuo, Katja Valli

The 33rd Annual International Dream Conference (organized by the International Association for the Study of Dreams), Kerkrade, the Netherlands, June 24-28, 2016

2016. Conference paper, oral presentation with abstract.

Dreams

Katja Valli

The SAGE Encyclopedia of Theory in Psychology

2016. Chapter in book. https://doi.org/10.4135/9781483346274.n81

Nightmares: Risk factors among the Finnish general adult population

Nils Sandman, Katja Valli, Erkki Kronholm, Antti Revonsuo, Tiina Laatikainen, Tiina Paunio

Sleep

2015. Article. https://doi.org/10.5665/sleep.4560

Dreaming furiously?: A sleep laboratory study on the dream content of people with Parkinson's disease and with or without rapid eye movement sleep behavior disorder

Katja Valli, Birgit Frauscher, Taina Peltomaa, Viola Gschliesser, Antti Revonsuo, Birgit Högl

Sleep Medicine

2015. Article. https://doi.org/10.1016/j.sleep.2014.10.014

I know how you felt last night, or do I?: Self- and external ratings of emotions in REM dreams

Pilleriin Sikka, Katja Valli, Tiina Virta, Antti Revonsuo

Consciousness and Cognition

2014. Article. https://doi.org/10.1016/j.concog.2014.01.011

Nightmares: Prevalence among the Finnish General Adult Population and War Veterans during 1972-2007

Nils Sandman, Katja Valli, Erkki Kronholm, Hanna M. Ollila, Antti Revonsuo, Tiina Laatikainen, Tiina Paunio

Sleep

2013. Article. https://doi.org/10.5665/sleep.2806 Open Access

Subjective and objective measures of affective states in REM sleep dreams

Pilleriin Sikka, Katja Valli, Tiina Virta, Antti Revonsuo

The 16th annual meeting of the Association for the Scientific Study of Consciousness (ASSC16), Brighton, UK, July 2-6, 2012

2012. Conference paper, poster. Open Access

Can observers link dream content to behaviours in rapid eye movement sleep behaviour disorder?: A cross-sectional experimental pilot study

Katja Valli, Birgit Frauscher, Viola Gschliesser, Elisabeth Wolf, Tina Falkenstetter, Suzana V. Schönwald, Laura Ehrmann, Anja Zangerl, Isabelle Marti, Sylvia M. Boesch, Antti Revonsuo, Werner Poewe, Birgit Högl

Journal of Sleep Research

2012. Article. https://doi.org/10.1111/j.1365-2869.2011.00938.x

How to assess ictal consciousness?

Mirja Johanson, Katja Valli, Antti Revonsuo

Behavioural Neurology

2011. Article. https://doi.org/10.3233/BEN-2011-0316 Open Access

Consciousness lost and found: Subjective experiences in an unresponsive state

Valdas Noreika, Leila Jylhänkangas, Levente Móró, Katja Valli, Kimmo Kaskinoro, Riku Aantaa, Harry Scheinin, Antti Revonsuo

Brain and Cognition

2011. Article. https://doi.org/10.1016/j.bandc.2011.09.002

Dreaming in the multilevel framework

Katja Valli