DOI: 10.6084/m9.figshare.24058740.v1
title: Noreika_DATA1

description: Dream EEG and Mentation (DREAM) dataset========================================<br>Dataset information--------------------- Common name: Noreika_DATA1- Full name: N/A- Authors: Valdas Noreika, Mila Oravecz, Lisa Svartsjö- Location: N/A- Year: N/A- Set ID: 16- Amendment: 0- Corresponding author ID: 2<br>Previous publications: Wong, W., Noreika, V., Móró, L., Revonsuo, A., Windt, J., Valli, K., & Tsuchiya, N. (2020). The Dream Catcher experiment: blinded analyses failed to detect markers of dreaming consciousness in EEG spectral power. Neuroscience of consciousness, 2020(1), niaa006. https://academic.oup.com/nc/article/2020/1/niaa006/5871813 Noreika, V., Valli, K., Lahtela, H., & Revonsuo, A. (2009). Early-night serial awakenings as a new paradigm for studies on NREM dreaming. International Journal of Psychophysiology, 74(1), 14-18. https://doi.org/10.1016/j.ijpsycho.2009.06.002<br>Correspondence: For enquiries, please contact Valdas Noreika valnoreika@gmail.com or v.noreika@qmul.ac.uk<br>Metadata--------- Key ID: 17- Date entered: 2022-06-10T12:37:31+00:00- Number of samples: 324- Number of subjects: 10- Proportion REM: 13%- Proportion N1: 0%- Proportion N2: 27%- Proportion W: 1%- Proportion experience: 33%- Proportion no-experience: 36%- Proportion healthy: 100%- Provoked awakening: Yes- Time of awakening: Night- Form of response: Structured- Date approved: 2023-06-09T12:25:16+00:00<br>How to decode data files------------------------In the Records file, Remarks contain information about the duration of experiment from the lights of in the beginning of the whole session to the individual awakening. <br>### Treatment group codes ###N/A<br>Experimental description------------------------Data were collected at the Centre for Cognitive Neuroscience, Department of Psychology, University of Turku, Turku, Finland, in 2006-2007. The experimenters were Valdas Noreika, Mila Oravecz and Lisa Svartsjö. The project was supervised by Katja Valli and Antti Revonsuo. Technical help was provided by Levente Móró.The experiment is described by Wong et al. (2020) as follows:Fifteen Finnish-speaking volunteers were recruited to the study from a larger pool of candidates. They were screened to have no issues with psychological and neurological health, take no central-nervous-system-affecting drugs, or have any sleep disorders at the time of the study. Their handedness was tested by means of the Edinburgh Handedness Questionnaire (Oldfield 1971).Participants spent one adaptation night in the sleep laboratory, in which the researchers aimed to assess the participants' sleep latency and ability to give clear dream reports, as well as to familiarize them with sleep laboratory environment. Five participants were excluded following adaptation nights due to sleeping difficulties in the laboratory, unclear dream reports upon awakening from NREM sleep, and/or sleep EEG artefacts due to sweating. The remaining 10 participants spent four experimental nights in the laboratory, for which each participant was compensated with 100 euros in total.Dream reports and PSGs were collected during the first 3–4 h of sleep following an early night serial-awakening (ENSA) paradigm (Noreika et al. 2009). Refer to Supplementary Material S1 in Wong et al. (2020) for our sleep data collection procedures and methods, Supplementary Material S2 in Wong et al. (2020) for the interview procedure and Supplementary Material S3 in Wong et al. (2020) for transcribed exemplar dream reports.<br>### DREAM categorization procedure ###All collected dream reports were divided by two blind raters (Master students in psychology) into four categories following Dement (1955): (i) dreamless sleep, (ii) white dream (i.e. the participant strongly felt they had had some experiences right before awakening, but could not recall any specific content), (iii) uncertain (between dreamless sleep and white dreaming) and (iv) dreamful (see Supplementary Material S1 in Wong et al. (2020) for details).Dream reports were also content analysed by the same two blind raters (Master students in psychology) using Orlinksy's Modified Scale for Perceptual Complexity of Dreams (see Table 1 in Noreika et al., 2009), with higher scores indicating more complex dreams (see Data/Reports).These categories were translated into DREAM experience report categories as follows:- Dreamless sleep -&gt; No experience- White dream -&gt; Experience without recall- Uncertain -&gt; No experience or Experience without recall, combined- Dreamful -&gt; Experience<br>Technical details-----------------PSG included 25-channel EEG, 2-channel EOG (E1 and E1) and 2-channel EMG (M1 and SM-M2).<br>### Data acquisition ###N/A<br>### Data preprocessing ###N/A