Katja Valli
Biographic Data
| ID | 1409102 |
|---|---|
| NAME | Katja Valli |
| GIVEN NAMES | Katja |
| FAMILY NAME | Valli |
| SIGNATURE | VALLI K |
| AFFILIATIONS | University of Turku |
| ORCID | 0000-0002-5133-8664 |
| VERIFIED | Yes |
| TOTAL WORKS | 16 |
| TOTAL CITATIONS | 7 |
| AUTHOR COUNT | 16 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2005 |
| LATEST PUBLICATION YEAR | 2024 |
| H-INDEX | 1 |
Viral simulations in dreams
Previous research indicates that the COVID-19 pandemic has affected dreaming negatively. We compared 1132 dreams collected with prospective two-week dream diary during the pandemic to 166 dreams collected before the pandemic. We hypothesized that the pandemic would increase the number of threatening events, threats related to diseases, and the severity of threats. We also hypothesized that dreams that include direct references to the pandemic wil…
Covid-19 on mind
Despite a surge of studies on the effects of COVID-19 on our well-being, we know little about how the pandemic is reflected in people's spontaneous thoughts and experiences, such as mind-wandering (or daydreaming) during wakefulness and dreaming during sleep. We investigated whether and how COVID-19-related general concern, anxiety, and daily worry are associated with the daily fluctuation of the affective quality of mind-wandering and dreaming, …
Dangerous waters
No Man is an Island’
Based on the Social Simulation Theory of dreaming (SST), we studied the effects of voluntary social seclusion on dream content and sleep structure. Specifically, we studied the Compensation Hypothesis , which predicts social dream contents to increase during social seclusion, the Sociality Bias – a ratio between dream and wake interactions – and the Strengthening Hypothesis , which predicts an increase in familiar dream characters during seclusio…
On no man’s land
To understand how anesthetics with different molecular mechanisms affect consciousness, we explored subjective experiences recalled after responsive and unresponsive sedation induced with equisedative doses of dexmedetomidine, propofol, sevoflurane, and S-ketamine in healthy male participants (N = 140). The anesthetics were administered in experimental setting using target-controlled infusion or vapouriser for one hour. Interviews conducted after…
The dynamics of affect across the wake-sleep cycle
Affective experiences occur across the wake-sleep cycle-from active wakefulness to resting wakefulness (i.e., mind-wandering) to sleep (i.e., dreaming). Yet, we know little about the dynamics of affect across these states. We compared the affective ratings of waking, mind-wandering, and dream episodes. Results showed that mind-wandering was more positively valenced than dreaming, and that both mind-wandering and dreaming were more negatively vale…
Dream sharing and the enhancement of empathy
This study replicated and extended a previous finding that the discussion of dreams increases the level of empathy toward the dreamer from those with whom the dream is discussed.The study addressed mediating variables for the empathy effect.Participants were recruited in dyads who already knew each other and were assigned dream-sharer and discusser roles.Each dyad used the Ullman dream appreciation technique to explore the relationship of the sha…
The Holocaust as a Lifelong Nightmare
Posttraumatic symptoms, including nightmares, are more prevalent in World War II survivors than in the general population, but how war experiences have affected subsequent dream content in specific survivor populations remains less explored. In the present study, we used self-reports collected in 1973 from Polish Auschwitz survivors (N = 150; 45 women) to investigate the prevalence of posttraumatic symptoms, classified according to the DSM-5 diag…
Social contents in dreams
Visual features and perceptual context modulate attention towards evolutionarily relevant threatening stimuli
The snake detection hypothesis claims that predatory pressure from snakes has shaped the primate visual system, but we still know very little about how the brain processes evolutionarily important visual cues, and which factors are crucial for quick detection of snakes. We investigated how visual features modulate the electrophysiological markers of early attentional processes. In Experiment 1, we compared snake, rope, gun, and bird images to iso…
I know how you felt last night, or do I? Self- and external ratings of emotions in REM sleep dreams
Dreaming in the multilevel framework
How to test the threat-simulation theory
Recurrent dreams
The effect of trauma on dream content--A field study of Palestinian children
In the present study, we compared the frequency and intensity of threatening events in the dreams of traumatized and nontraumatized Palestinian children. The aim of the study was to test some of the predictions and hypotheses derived from the Threat Simulation Theory proposing an evolutionary function for dreaming. Most, but not all, of our hypotheses were supported by the findings. We discuss the results in the light of the Threat Simulation The…
The threat simulation theory of the evolutionary function of dreaming
The effect of trauma on dream content--A field study of Palestinian children
In the present study, we compared the frequency and intensity of threatening events in the dreams of traumatized and nontraumatized Palestinian children. The aim of the study was to test some of the predictions and hypotheses derived from the Threat Simulation Theory proposing an evolutionary function for dreaming. Most, but not all, of our hypotheses were supported by the findings. We discuss the results in the light of the Threat Simulation The…
The threat simulation theory of the evolutionary function of dreaming
Recurrent dreams
The effect of trauma on dream content--A field study of Palestinian children
In the present study, we compared the frequency and intensity of threatening events in the dreams of traumatized and nontraumatized Palestinian children. The aim of the study was to test some of the predictions and hypotheses derived from the Threat Simulation Theory proposing an evolutionary function for dreaming. Most, but not all, of our hypotheses were supported by the findings. We discuss the results in the light of the Threat Simulation The…
How to test the threat-simulation theory
Dreaming in the multilevel framework
I know how you felt last night, or do I? Self- and external ratings of emotions in REM sleep dreams
Visual features and perceptual context modulate attention towards evolutionarily relevant threatening stimuli
The snake detection hypothesis claims that predatory pressure from snakes has shaped the primate visual system, but we still know very little about how the brain processes evolutionarily important visual cues, and which factors are crucial for quick detection of snakes. We investigated how visual features modulate the electrophysiological markers of early attentional processes. In Experiment 1, we compared snake, rope, gun, and bird images to iso…
Social contents in dreams
The Holocaust as a Lifelong Nightmare
Posttraumatic symptoms, including nightmares, are more prevalent in World War II survivors than in the general population, but how war experiences have affected subsequent dream content in specific survivor populations remains less explored. In the present study, we used self-reports collected in 1973 from Polish Auschwitz survivors (N = 150; 45 women) to investigate the prevalence of posttraumatic symptoms, classified according to the DSM-5 diag…
On no man’s land
To understand how anesthetics with different molecular mechanisms affect consciousness, we explored subjective experiences recalled after responsive and unresponsive sedation induced with equisedative doses of dexmedetomidine, propofol, sevoflurane, and S-ketamine in healthy male participants (N = 140). The anesthetics were administered in experimental setting using target-controlled infusion or vapouriser for one hour. Interviews conducted after…
The dynamics of affect across the wake-sleep cycle
Affective experiences occur across the wake-sleep cycle-from active wakefulness to resting wakefulness (i.e., mind-wandering) to sleep (i.e., dreaming). Yet, we know little about the dynamics of affect across these states. We compared the affective ratings of waking, mind-wandering, and dream episodes. Results showed that mind-wandering was more positively valenced than dreaming, and that both mind-wandering and dreaming were more negatively vale…
Dream sharing and the enhancement of empathy
This study replicated and extended a previous finding that the discussion of dreams increases the level of empathy toward the dreamer from those with whom the dream is discussed.The study addressed mediating variables for the empathy effect.Participants were recruited in dyads who already knew each other and were assigned dream-sharer and discusser roles.Each dyad used the Ullman dream appreciation technique to explore the relationship of the sha…
No Man is an Island’
Based on the Social Simulation Theory of dreaming (SST), we studied the effects of voluntary social seclusion on dream content and sleep structure. Specifically, we studied the Compensation Hypothesis , which predicts social dream contents to increase during social seclusion, the Sociality Bias – a ratio between dream and wake interactions – and the Strengthening Hypothesis , which predicts an increase in familiar dream characters during seclusio…
Covid-19 on mind
Despite a surge of studies on the effects of COVID-19 on our well-being, we know little about how the pandemic is reflected in people's spontaneous thoughts and experiences, such as mind-wandering (or daydreaming) during wakefulness and dreaming during sleep. We investigated whether and how COVID-19-related general concern, anxiety, and daily worry are associated with the daily fluctuation of the affective quality of mind-wandering and dreaming, …
Dangerous waters
Viral simulations in dreams
Previous research indicates that the COVID-19 pandemic has affected dreaming negatively. We compared 1132 dreams collected with prospective two-week dream diary during the pandemic to 166 dreams collected before the pandemic. We hypothesized that the pandemic would increase the number of threatening events, threats related to diseases, and the severity of threats. We also hypothesized that dreams that include direct references to the pandemic wil…
Psychology (16 works) · Sleep and Wakefulness Research (11 works) · Dream (10 works) · Psychotherapist (9 works) · Cognitive psychology (8 works) · Neuroscience (8 works) · Sleep and related disorders (8 works) · Developmental psychology (6 works) · Social Psychology (6 works) · Memory and Neural Mechanisms (5 works)