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
Laura Mumoli, Giovanni Tripepi, Umberto Aguglia, Antonio Augimeri, Rossella Baggetta, Francesca Bisulli, Antonella Bruni, Salvatore Maria Cavalli, Alfredo D’Aniello, Ornella Daniele, Carlo Di Bonaventura, Giancarlo Di Gennaro, Jinane Fattouch, Edoardo Ferlazzo, Alessandra Ferrari, A. T. Giallonardo, Sara Gasparini, Salvatore Nigro, Andrea Romigi, Vito Sofia, Paolo Tinuper, Maria Grazia Vaccaro, Leila Zummo, Aldo Quattrone, Antonio Gambardella, Angelo Labate
Behavioral Sciences August 7, 2017 DOI: 10.3390/bs7030050 (opens in new tab) via OpenAlex
Summary
AI-generated from the abstractDéjà vu is experienced by 73% of healthy Italian adults, with frequency declining as age increases. The Italian version of the Inventory Déjà Vu Experiences Assessment (I-IDEA) reliably detects and characterizes the phenomenon. In a sample of 542 healthy volunteers aged 18–70, déjà vu was inversely related to age, derealisation, jamais vu, precognitive dreams, depersonalization, paranormal activity, remembering dreams, travel frequency, and daydreams.
Study at a glance
| Characteristics | Observational study Peer reviewed |
|---|---|
| Sample size | 542 |
| Population | Healthy Italian adults aged 18–70 years |
| Keywords | Déjà vu Phenomenon Paranormal Observational study Normative |
| Citations | 4 |
| Key finding | 73% of healthy Italian adults experience déjà vu, and its frequency is inversely related to age and several subjective phenomena. |
Abstract
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.