Cognitive Disengagement Syndrome
I was unfamiliar with Cognitive Disengagement Syndrome and am devoting today to it. Becker (2025) published “Cognitive Disengagement Syndrome: A construct at the crossroads” in American Psychologist. Here are some excerpts:
Initially described in the mid-1980s, cognitive disengagement syndrome (CDS; previously termed sluggish cognitive tempo) is a set of symptoms comprising excessive daydreaming, mental confusion, and hypoactivity that is distinct from attention-deficit/hyperactivity disorder and other psychopathology dimensions and independently associated with functional outcomes. This article provides a broad overview of the history of the CDS construct, its terminology, and the current state of the science. Although there has been a marked upsurge in research on CDS, including psychometrically rigorous assessment tools and an emerging pattern of findings across numerous domains of functioning, the existing literature base also points to the importance of marshaling an ambitious research agenda that can guide CDS into its next era. Implications of this research for possible conceptualizations of CDS as a distinct disorder, diagnostic specifier, or transdiagnostic dimension are discussed.
There is accumulating evidence that some individuals display a unique pattern of attentional difficulties not fully captured by other psychopathologies including either attention-deficit/hyperactivity disorder (ADHD) or internalizing symptoms. The term “sluggish cognitive tempo” (SCT) was initially coined to describe children who appear as frequently adrift in their thoughts, look spacey and confused when interacting with others, and seem to operate at a slower speed than their peers, with a recent Work Group consensus change in terminology to “cognitive disengagement syndrome” (CDS; Becker et al., 2023).
Despite increasing recognition of CDS among professionals and the public alike, our nascent but growing understanding of CDS remains unfamiliar to most researchers and clinicians in psychology, psychiatry, and related fields.
Historically (and still so today), the study of CDS has been closely tied to the study of ADHD, with CDS first emerging from early studies seeking to understand the nature and factor structure of inattention, hyperactivity, and impulsivity in children. Following influential work by Virginia Douglas emphasizing the role of sustained attention difficulties in contributing to the deficits and impairments observed in hyperactive children (Douglas, 1972), the Diagnostic and Statistical Manual of Mental Disorders, third edition prioritized inattention by replacing the earlier diagnostic term of hyperkinetic reaction of childhood with attention-deficit disorder (ADD). The introduction of a diagnostic subtype without hyperactivity accelerated new research to characterize this rarely studied, but clinically observed, group of children for whom deficits in attention regulation were front and center.
It was during this same era that a small number of items involving daydreaming, drowsiness, and lethargy began to garner interest in studies seeking to understand the structure and nature of behavior and attention problems in children. These items were included on very early parent and teacher checklists seeking to identify the structure of children’s behavior problems. The initial studies examining these checklists resulted in two dimensions termed conduct problem and personality problem, with daydreaming and associated behaviors included in the latter dimension (Himmelweit, 1953; Peterson, 1961). By the 1970s, additional factors were identified, including a more narrow “sluggishness” factor comprised of items assessing drowsiness, being easily flustered or confused, drowsiness, passivity, and fatigue, as well as numerous inattentive and other behaviors (Dielman et al., 1971). A decade later, seminal work by Benjamin Lahey and his students led to the first empirical support for separate sluggish tempo and inattention–disorganization factors. Sluggish cognitive tempo entered the nomenclature to describe this group of behaviors (Lahey et al., 1987), a term that took hold for the next several decades.
In addition to the importance of additional research examining the psychometric properties of existing rating scales and interviews for assessing CDS, including in different cultural contexts (Becker, 2019), there is also a need to evaluate performance-based tasks, which may be useful in the assessment of CDS. This may include existing neuropsychological and behavioral tasks, including tasks assessing processing speed, working memory, and attention networks, though current findings examining these domains have yielded mixed findings (see the CDS and Cognition section and Barkley et al., 2022). In sum, in addition to rating scales, rigorous, innovative work in the development of assessment methods in CDS remains a research priority.
However, the existing studies have shown that CDS is not only empirically separable from ADHD inattention but also from depression, anxiety, somatic complaints, ADHD hyperactivity–impulsivity, and oppositional defiant/conduct disorder behaviors. Importantly, these distinctions have been found in numerous types of samples, including community, ADHD, autistic, and psychiatrically hospitalized youth, as well as in college students. [T]here is strong evidence that CDS is distinct from ADHD symptoms and increasing evidence for its distinction from other psychopathologies and sleep-related problems.
Although distinct from other psychopathologies, CDS also shows a distinct pattern of associations with internalizing and externalizing dimensions. Most consistently, higher CDS symptoms are positively correlated with both anxiety and depressive symptoms, associations that almost always remain above and beyond ADHD symptoms. CDS may be more consistently or strongly associated with depression than with anxiety (Becker et al., 2023), though more studies are needed to examine this possibility, and common genetic and/or environmental factors may be important for understanding the association between CDS and anxiety (Scaini et al., 2023). In addition, extant studies have found CDS symptoms to be associated with higher suicidal ideation/risk above and beyond ADHD symptoms and depressive symptoms.
Quite an opposite pattern of findings is found with externalizing behaviors. Although CDS symptoms may be positively associated with externalizing behaviors in bivariate analyses, this association is generally eliminated or becomes negative when CDS and ADHD symptoms are examined simultaneously to identify unique effects (Becker et al., 2023). The pattern of findings is one that CDS and ADHD inattention part ways when they are included as simultaneous predictors of other psychopathologies, with higher CDS symptoms being uniquely associated with higher internalizing symptoms and somatic complaints and ADHD inattentive symptoms being uniquely associated with higher externalizing symptoms and aggressive behaviors.
Sleep and autism are two domains with increasing interest in relation to CDS (Kaçmaz et al., 2024). First, regarding sleep, above and beyond ADHD symptoms, CDS symptoms are associated with poorer sleep functioning, as well as greater eveningness circadian preference. Experimental data also show that shortened sleep duration causally contributes to increased CDS symptoms, underscoring the need for additional experimental and longitudinal studies examining causal and directional effects. It is estimated that 30%–50% of autistic youth have elevated CDS symptoms. Both autism and insomnia symptom scores in childhood predict higher CDS scores in adolescence.
Findings examining social skills are mixed, with CDS potentially being associated with teacher-reported, but not caregiver-reported, social skills. However, a more nuanced look has revealed a specific profile of CDS-related social functioning (for a review, see Fredrick & Becker, 2023a). Children with ADHD and co-occurring CDS symptoms are more withdrawn from their peers than other children with ADHD and are also less likely to pick up on subtle social cues. A recent study using school observations found that students with elevated CDS symptoms (irrespective of co-occurring ADHD) spent more time alone or engaged in parallel play during recess than age- and sex-matched students, above and beyond ADHD and internalizing symptoms (Becker, Vaughn, et al., 2024).
ADHD symptoms, particularly inattention, are strongly associated with poorer academic functioning (Willcutt et al., 2012). CDS symptoms are also significantly associated with poorer academic functioning. Studies often, but not always, find CDS symptoms to be independently related to academic functioning outcomes above and beyond ADHD symptoms and/or demographic characteristics. Still, ADHD inattentive symptoms appear to be more consistently and strongly associated than CDS symptoms with academic impairment. Importantly, as in other CDS research, many of the studies in this area have used nonoptimal measures of CDS and also frequently relied on brief, global measures of academic impairment. Further, several of these studies used samples recruited specifically for ADHD, including for academic-focused intervention trials. A recent study recruited students based on the presence or absence of elevated CDS symptoms, irrespective of ADHD, and found that students with CDS had wide-ranging academic difficulties compared with students without CDS (Becker, Epstein, et al., 2022).
Very few studies have examined occupational functioning. In a nationally representative sample in the United States, adults with elevated CDS reported greater work-occupational impairment than adults with elevated ADHD symptoms. Among college students, CDS symptoms were independently associated with higher work-related impairment. By contrast, among adults presenting for an ADHD evaluation, CDS symptoms were not independently associated with either self-report or collateral report of work-related impairment. Although not directly focused on occupational functioning, CDS symptoms are uniquely associated with adults’ experiences of greater perceived stress, maladaptive problem solving, and lower quality of life.
A central cognitive deficit underlying CDS has not been identified, as highlighted in a recent review of the literature examining CDS in relation to neurocognition and daily life executive function by Barkley et al. (2022). Given the early-established moniker of sluggish cognitive tempo, which clearly implies slowed cognitive processing, processing speed has been most frequently examined in neuropsychological studies and is most thoroughly reviewed here. Studies testing CDS in relation to processing speed have yielded equivocal findings (and, indeed, this was part of the rationale for the recommended change in terminology).
Still, other studies find CDS to be independently associated, albeit often modestly, with slower processing speed. Other studies point to a more nuanced understanding: CDS symptoms may be more strongly associated with slower processing in younger versus older children, when using teacher versus parent ratings of CDS, or when tasks have greater fine motor demands. Slower processing speed in early childhood also prospectively predicts both CDS and ADHD inattentive symptoms in middle childhood (Becker, Dvorsky, et al., 2021). A recent study of children recruited for the full range of CDS symptoms found higher CDS symptoms to be associated above and beyond ADHD inattentive symptoms with slower performance across a range of cognitive domains, including verbal inhibition, rapid naming/reading, planning, divided attention, and set shifting (Tamm et al., 2023). By contrast, ADHD inattentive, but not CDS, symptoms were consistently associated with poorer performance across these neurocognitive tasks (Tamm et al., 2023), an important dissociation requiring follow-up.
Studies examining CDS and components of neurocognition have not found convincing evidence of an association with response inhibition or reaction time variability, whereas findings with working memory and vigilance/sustained attention are more mixed (Barkley et al., 2022). Very few studies have examined other neuropsychological domains (e.g., selective attention, planning, interference control), greatly limiting the conclusions that can be drawn. This is one of the numerous areas where additional research is needed, recognizing also that, as with ADHD, CDS is likely to be characterized by neurocognitive complexity and heterogeneity.
[T]he study of CDS remains in its infancy. By way of simple comparison, a basic search of title/abstract terms was conducted in the PubMed database on April 11, 2024. A search with the terms “attention deficit,” “ADHD,” or “hyperkinesis” returned 45,823 results. In stark contrast, a search with the terms “sluggish cognitive tempo,” “sluggish tempo,” or “cognitive disengagement syndrome” returned 303 results.
Three primary possibilities for how CDS may ultimately be best conceptualized have been proposed: CDS as a distinct categorical disorder, CDS as a diagnostic specifier, and CDS as a transdiagnostic dimension. The first major interest in CDS as a potentially distinct psychiatric disorder emerged a decade ago, when in a Journal of Abnormal Child Psychology commentary Barkley (Barkley, 2014) concluded that “growing evidences demonstrates that SCT [CDS] is most probably a distinct disorder from ADHD but may overlap with it” (p. 118). Establishing CDS as a psychiatric disorder would recognize the substantial and growing empirical literature supporting the distinctiveness of this syndrome from other psychopathologies, as well as its negative impact across a range of functional outcomes. In addition to reduced confusion about the nature and status of CDS, recognition as a distinct disorder would also allow clinicians to document and seek insurance reimbursement for the condition. Providing clarity and care to patients and families sooner rather than later, whether within a diagnostic or other framework, is of great importance.
In considering CDS, it would be prudent to consider how normative and even beneficial behaviors such as daydreaming are described and discussed as part of any recognized disorder, as the experiences and associated impairments among individuals experiencing elevated CDS are real and efforts to understand and support these people would be undermined should a so-called daydream disorder (Aldhous, 2014) enter the public discourse as potential fodder for late-night television jokes. Wakefield’s harmful dysfunction analysis is helpful here, emphasizing that “there are many negative conditions that are not disorders, and many of them contain symptoms and are clinically significant in that they cause distress or role impairment (e.g., grief)” (Wakefield, 2007, p. 151). A condition should not have to be categorized as its own psychiatric disorder to be deemed conceptually and clinically important and worth further scientific and clinical attention.
A related but alternative possibility would be to examine CDS as a specifier across ADHD presentations. The closest analogy here is probably the inclusion of limited prosocial emotions (LPE) as a diagnostic specifier for conduct disorder and also, in the 11th edition of the International Classification of Diseases, for oppositional defiant disorder. Given the strong associations CDS has with several other psychopathology dimensions, including symptoms of ADHD, mood, anxiety, and sleep disorders, CDS will likely cut across many current diagnostic categories, particularly when more robust assessment methods or clinically referred samples are used.
These and other considerations raise the possibility that CDS may not ultimately be best conceptualized as its own categorical disorder but rather a construct of transdiagnostic importance. That is, CDS may represent a cluster of symptoms that inform understanding developmental pathways, risk prediction, and treatment response across a range of conditions.
As research examining CDS in relation to other psychopathologies advances, it will be critical to situate CDS within other models of psychopathology. To date, CDS has been examined in relation to specific, generally DSM disorder-based dimensions of psychopathology, though important dimensions remain unexamined (e.g., thought disorders). Research examining CDS from a transdiagnostic perspective would also be well-positioned to advance translational understanding. Carefully designed studies would be informative to determine whether CDS is most useful as a specifier for particular disorders (e.g., ADHD) or has broader transdiagnostic value while also guiding where and how CDS may be positioned within hierarchical models of psychopathology.
The existing literature base also points to the importance of marshaling an ambitious research agenda that can guide CDS into its next era. Such research is needed to inform a theoretical model of CDS and its position in relation to other psychopathologies and developmental outcomes. To achieve this, the road ahead will require increased collaboration, creativity, and rigor to build theory and, ultimately, support the well-being of individuals with this distinct syndrome.
This is along post but I thought it was important to introduce the term to those, like me, who had been unfamiliar with it. It seems to me that differentiating Cognitive Disengagement Syndrome from ADHD, inattentive type is important, especially given its potential value as a transdiagnostic construct.