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This study describes the development of the Maladaptive Daydreaming Scale (MDS), a 14-item self-report instrument designed to gauge abnormal fantasizing. Our sample consisted of 447 English-speaking individuals from 45 different countries. A 3-correlated-factors model best presented the underlying dimensions Yearning, Kinesthesia and Impairment, capturing related rewarding experiences as well as psychological impairment of maladaptive daydreaming. MDS scores were associated with obsessive-compulsive behavior and thoughts, dissociative absorption, attention deficit, and high sense of presence during daydreaming, but less with psychotic symptoms. The MDS and its subscale demonstrated good validity, sound internal consistency and temporal stability and discriminated well between self-identified individuals with and without maladaptive daydreaming. Considering the instrument's high sensitivity and specificity levels, it seems an excellent measure for future investigation of MD that will, hopefully, shed light on the etiology and psycho-biological mechanisms involved in this mental condition, as well as on the development of effective MD treatment methods.

This study explores the recently described phenomenon of Maladaptive Daydreaming (MD) and attempts to enhance the understanding of its features. It documents the experiences of 340 self-identified maladaptive daydreamers who spend excessive amounts of time engaged in mental fantasy worlds, in comparison to 107 controls. Our sample included a total of 447 individuals, aged 13-78, from 45 countries who responded to online announcements. Participants answered quantitative and qualitative questions about their daydreaming habits and completed seven questionnaires assessing mental health symptoms. Findings demonstrated that MD differs significantly from normative daydreaming in terms of quantity, content, experience, controllability, distress, and interference with life functioning. Results also demonstrated that Maladaptive Daydreamers endorsed significantly higher rates of attention deficit, obsessive compulsive and dissociation symptoms than controls. In sum, findings suggested that MD represents an under-acknowledged clinical phenomenon that causes distress, hinders life functioning and requires more scientific and clinical attention.