The term is not part of established medical taxonomy and is mostly found in theoretical or exploratory contexts. IIstörning implies simultaneous disruption in two processing streams, such as sensory integration and higher-order executive control, or in two neural networks that coordinate information flow.
Reported features are heterogeneous and not universally defined. Commonly discussed signs include difficulties in tasks requiring rapid integration across modalities, inconsistent performance on similar tasks, increased distractibility, pace- or load-dependent accuracy declines, and working memory lapses when sequencing or planning is required. These symptoms may appear in childhood or adulthood and often co-occur with other neurodevelopmental or psychiatric conditions.
No consensus exists on causation. Hypotheses focus on disrupted connectivity between dual processing systems or networks, such as sensory integration pathways and executive-control networks, possibly influenced by genetic factors and environmental stressors. The concept remains largely theoretical and is not supported by a standardized set of biomarkers.
There are no standardized diagnostic criteria for IIstörning. Assessments in speculative or research settings may use neuropsychological testing, cross-modal processing tasks, and functional imaging to explore dual-domain impairments. Differential diagnoses include ADHD, autism spectrum disorder, learning disorders, and other conditions with broader attentional or processing difficulties.
No specific, evidence-based treatment exists for IIstörning. Management is typically adaptive and multidisciplinary, emphasizing educational accommodations, cognitive rehabilitation, and strategies to reduce sensory overload and support executive functioning. Prognosis is variable and depends on comorbidity, support, and individual resilience.