![]() Whereas hyperactivity and impulsivity are often the main symptoms in children and decrease with increasing age, adults are mostly affected by inattention ( Uchida et al., 2015). Although it was often seen as a disorder that only affects children, around 60% of cases report symptom persistence in adulthood ( Sibley et al., 2017). ![]() Further, the enhanced P200 amplitude might reflect more sensory registration and therefore deficient inhibition mechanisms in adults with ADHD.Īttention deficit and hyperactivity disorder (ADHD) is a neurodevelopmental disorder that is characterized by inappropriate levels of inattention, hyperactivity, and/or impulsivity ( American Psychiatric Association, 2013). This might induce consequences for later, higher order attentional deployment. Further, the correlation of the assessed sensory profiles with the EEG parameters revealed a negative correlation between the P200 component and sensation seeking behavior.Ĭonclusion: Our findings show increased auditory crossmodal activity that might reflect an altered stimulus processing resource allocation in ADHD. Statistical analysis of behavioral data showed poorer performance of subjects with ADHD as well as higher discrimination thresholds. At the intramodal channels, a significantly enhanced N200 amplitude was observed in the control group. Results: At the occipital channel O2 that reflects possible crossmodal activations, a significantly enhanced P200 amplitude was measured in the patient group. For evaluating intramodal and crossmodal activations, we chose four EEG channels for statistical analysis and group-wise comparison. Sensory profiles and ADHD symptoms were assessed with inattention as well as childhood ADHD scores. ERP components P50, P100, N100, P200 and N200 were measured during the performance of a unimodal auditory and visual discrimination task in a block design. Methods: 15 adult subjects with clinically diagnosed ADHD and 14 healthy controls comparable in age and gender were included. In this study, we used, for the first time, electroencephalography to identify a potential abnormal regulated crossmodal activation in adult ADHD. This crossmodal activation is interpreted as the reallocation of more attentional resources to the visual domain as well as deficient sensory inhibition. There is evidence that the visual cortex shows more activation during a focused auditory task in adults with ADHD than in healthy controls. It has further been shown that deficiencies not only exist on an intramodal, but also on a multimodal level. ![]() For example, during the processing of auditory stimuli comparable low sensory thresholds account for symptoms like higher distractibility and auditory hypersensitivity in patients with ADHD. In order to understand the basis for this multifaceted disorder, the investigation of sensory processing aberrancies recently reaches more interest.
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