International journal of psychophysiology : official journal of the International Organization of Psychophysiology
October 1, 2009
Valdas Noreika, Katja Valli, Hetti Lahtela et al.
A new experimental paradigm called "Early-Night Serial Awakenings" (ENSA) was explored to find out its strengths and weaknesses for psychophysiological studies of NREM sleep dreaming. Five participants spent 20 experimental nights in the sleep laboratory, and were serially awakened with approximately 24-minute intervals during Stages 2 and 3 of NREM sleep. As a total, 164 awakenings were...
The American Journal of Psychology
April 1, 2009
Katja Valli, Antti Revonsuo
132 citations
The recently proposed threat simulation theory (TST) states that dreaming about threatening events has a biological function. In the past few years, the TST has led to several dream content analysis studies that empirically test the theory. The predictions of the TST have been investigated mainly with a new content analysis system, the Dream Threat Scale (DTS), a method developed for...
Epilepsy & behavior : E&B
August 1, 2008
Mirja Johanson, Katja Valli, Antti Revonsuo et al.
19 citations
Epilepsy research suffers from a deficiency of systematic studies concerning the phenomenology of the contents of consciousness during seizures, partially because of the lack of suitable research methods. The Phenomenology of Consciousness Inventory (PCI), a standardized, valid, and reliable questionnaire, was used here to study which dimensions of the contents of consciousness are distorted...
Consciousness and Cognition
March 1, 2005
Katja Valli, Antti Revonsuo, Outi Pälkäs et al.
The threat simulation theory of dreaming (TST) () states that dream consciousness is essentially an ancient biological defence mechanism, evolutionarily selected for its capacity to repeatedly simulate threatening events. Threat simulation during dreaming rehearses the cognitive mechanisms required for efficient threat perception and threat avoidance, leading to increased probability of...