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Validation Study of Italian Version of Inventory for Déjà Vu Experiences Assessment (I-IDEA): A Screening Tool to Detect Déjà Vu Phenomenon in Italian Healthy Individuals

Institute of Neurology, University Magna Græcia, 88100 Catanzaro, Italy
Institute of Clinical Physiology, National Research Council (IFC-CNR), Research Unit, 89100 Reggio Calabria, Italy
Regional Epilepsy Center, Bianchi Melacrino Morelli Hospital, 89100 Reggio Calabria, Italy
Institute of Molecular Bioimaging and Physiology of the National Research Council (IBFM-CNR), 88100 Catanzaro, Italy
IRCCS Istituto delle Scienze Neurologiche, 40100 Bologna; Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126 Bologna, Italy
IRCSS Neuromed, 86077 Pozzilli, Italy
Experimental Biomedicine and Clinical Neuroscience Department (BioNeC), University of Palermo, 90100 Palermo, Italy
Department of Neuroscience, Neurology Unit, “Sapienza” University, 00100 Rome, Italy
Clinical Neurophysiology, Department of Neuroscience, Ophthalmology and Genetics, University of Genoa, 16100 Genova, Italy
Sleep Medicine Centre, Neurophysiopathology Unit, Department of Systems Medicine, “Tor Vergata” University of Rome, 00100 Rome, Italy
Department “G. F. Ingrassia” University of Catania, Via S. Sofia 78, 95123 Catania, Italy
Author to whom correspondence should be addressed.
Behav. Sci. 2017, 7(3), 50;
Received: 23 June 2017 / Revised: 10 July 2017 / Accepted: 3 August 2017 / Published: 7 August 2017
PDF [405 KB, uploaded 11 August 2017]
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The Inventory Déjà Vu Experiences Assessment (IDEA) is the only screening instrument proposed to evaluate the Déjà vu (DV) experience. Here, we intended to validate the Italian version of IDEA (I-IDEA) and at the same time to investigate the incidence and subjective qualities of the DV phenomenon in healthy Italian adult individuals on basis of an Italian multicentre observational study. In this study, we report normative data on the I-IDEA, collected on a sample of 542 Italian healthy subjects aging between 18–70 years (average age: 40) with a formal educational from 1–19 years. From September 2013 to March 2016, we recruited 542 healthy volunteers from 10 outpatient neurological clinics in Italy. All participants (i.e., family members of neurological patients enrolled, medical students, physicians) had no neurological or psychiatric illness and gave their informed consent to participate in the study. All subjects enrolled self-administered the questionnaire and they were able to complete I-IDEA test without any support. In total, 396 (73%) of the 542 healthy controls experienced the DV phenomenon. The frequency of DV was inversely related to age as well as to derealisation, jamais vu, precognitive dreams, depersonalization, paranormal activity, remembering dreams, travel frequency, and daydreams (all p < 0.012). The Italian version of IDEA maintains good properties, thus confirming that this instrument is reliable for detecting and characterising the DV phenomenon. View Full-Text
Keywords: Déjà vu; Inventory for Déjà Vu Experiences Assessment (IDEA); prevalence of DV Déjà vu; Inventory for Déjà Vu Experiences Assessment (IDEA); prevalence of DV

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Mumoli, L.; Tripepi, G.; Aguglia, U.; Augimeri, A.; Baggetta, R.; Bisulli, F.; Bruni, A.; Cavalli, S.M.; D’Aniello, A.; Daniele, O.; Di Bonaventura, C.; Di Gennaro, G.; Fattouch, J.; Ferlazzo, E.; Ferrari, A.; Giallonardo, A.; Gasparini, S.; Nigro, S.; Romigi, A.; Sofia, V.; Tinuper, P.; Vaccaro, M.G.; Zummo, L.; Quattrone, A.; Gambardella, A.; Labate, A. Validation Study of Italian Version of Inventory for Déjà Vu Experiences Assessment (I-IDEA): A Screening Tool to Detect Déjà Vu Phenomenon in Italian Healthy Individuals. Behav. Sci. 2017, 7, 50.

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