Comparison of the Cognitive Disengagement and Hypoactivity Components of Sluggish Cognitive Tempo in Autism, ADHD, and Population-Based Samples of Children.

Researchers studied attention difficulties in nearly 3,000 children with autism, ADHD, and typical development. They found that 'sluggish cognitive tempo' (being spacey, confused, or low energy) affects 32% of autistic children. This condition has two parts: mental fog/spacing out, and physical slowness/tiredness. Autistic children showed more mental fog symptoms than physical slowness compared to other groups.

This study examined Sluggish Cognitive Tempo (SCT) symptoms in 2,874 children across autism, ADHD, and typically developing populations. Researchers identified two distinct components of SCT: cognitive disengagement (being confused, staring, preoccupied) and hypoactivity (being sluggish, drowsy, tired). SCT prevalence was highest in autism (32%), followed by ADHD-Inattentive (27%), ADHD-Combined (18%), and elementary school students (7%). In autism and ADHD-Combined groups, cognitive disengagement symptoms were significantly more prevalent than hypoactivity symptoms.

The findings support the international work group's proposal to reconceptualize SCT as 'cognitive disengagement syndrome' with two distinct symptom dimensions.

Findings suggest SCT assessment should consider two distinct dimensions. High SCT prevalence in autism warrants clinical attention. Different symptom profiles between groups may inform targeted intervention approaches for cognitive versus motor-related difficulties.

Single informant (mothers only) ratings may introduce bias. Cross-sectional design limits understanding of symptom development over time. Study type not specified, limiting methodological evaluation.

An international Sluggish Cognitive Tempo (SCT) Work Group proposed a new term for SCT, "cognitive disengagement syndrome," that more accurately describes the syndrome than does SCT. According to the Work Group, symptoms of SCT represent a cognitive dimension (cognitive disengagement) and a motor dimension (hypoactivity). Our study determined (1) if distinct factors representing cognitive disengagement and hypoactivity emerged when SCT items were factor analyzed and (2) the degree of differences in cognitive disengagement and hypoactivity within diagnostic groups. Mothers rated 1,177 children with autism, 725 with ADHD-Combined, and 307 with ADHD-Inattentive (4-17 years) and 665 elementary school children (6-12 years) on the Pediatric Behavior Scale (PBS).

SCT prevalence rates were autism 32%, ADHD-Inattentive 27%, ADHD-Combined 18%, and elementary school students 7%. Factor analysis of the SCT items yielded two factors reflecting cognitive disengagement (in a fog/confused and stares/preoccupied/in own world) and hypoactivity (sluggish/slow moving/low energy, drowsy/sleepy/not alert, and tires easily) in all diagnostic groups. Cognitive disengagement prevalence rates and scores were significantly higher than hypoactivity in the autism and ADHD-C groups and in the autism and ADHD-C subgroups of children with SCT (but not in the ADHD-I and elementary school total groups and SCT subgroups). Our findings factor analyzing five SCT items support two SCT subfactors: cognitive disengagement and hypoactivity.