Browsing by Author "Tommasel, Antonela"

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    Lucid dreams and out-of-body experiences reports : differences in emotional content, dream awareness, and dream control
    (2023) Gallo, Francisco T.; Herrero, Nerea L.; Tommasel, Antonela; Godoy, Daniela; Spiousas, Ignacio; Gasca-Rolin, Miguel; Ramele, Rodrigo; Gleiser, Pablo M.; Forcato, Cecilia
    Lucid dreams (LDs) and out-of-body experiences (OBEs) are phenomena characterized by the return of higher cognitive abilities during sleep, including reflective self-awareness and abstract thought. Given the similarities in reflective self-awareness between LDs and OBEs, some authors consider them variations of the same phenomenon. This study aimed to compare the differences in content between non-LDs, LDs, and OBEs obtained from 60 participants over a two-month period, with 916 dream reports collected. The dream reports were analyzed using automatic methods based on Lexicons such as NRC Emotion Lexicon and Empath, and were scored based on Hall and Van de Castle's dream content scoring system with variations and additional measures. Results showed that OBE dreams were characterized by higher occurrences of negative emotions compared to both lucid and non-lucid dreams as measured by automatic and manual scoring systems. Also, more OBE dream reports contained words related to agency and insight, higher manual scoring of dream control-related expressions, and more total sensations, dream activities, reference to prospective memory evocations, spatial and body references, and more difficulties with movement within the dream environment, than lucid dreams. The findings support the idea that OBEs represent unique experiences distinguished from lucid dreams.
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    Structural differences between non-lucid, lucid dreams and out-of-body experience reports assessed by graph analysis
    (2021) Gallo, Francisco; Tommasel, Antonela; Herrero, Nerea; Forcato, Cecilia; Godoy, Daniela; Gleiser, Pablo
    "It has been recently found using graph theory that measures of network structure can predict ratings of dream complexity, where increases in connectedness and decreases in randomness are observed in relation to increasing dream report complexity. This approach proved to be useful to differentiate dream reports in the pathological population as well as NREM and REM dream reports, but it has not yet been used to study the differences between different oneiric experiences. In this work we analyze dream reports that include non-lucid, lucid dreams and out-of body experiences initiated from sleep paralysis. The reports are presented as directed graphs, where each different word plays the role of a node, and consecutive words are connected by a directed, unweighted edge. We analyze different network measures to compare the graphs. Preliminary results presented here suggest that both local measures, such as the degree of nodes, and global measures, such as clustering and the number of strongly connected components, allow for a categorization of different dream experiences."