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Sluggish Cognitive Tempo and Its Neurocognitive, Social and Emotive

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Sluggish Cognitive Tempo and Its Neurocognitive, Social and Emotive Mueller et al. Journal of Molecular Psychiatry 2014, 2:5 http://www.jmolecularpsychiatry.com/content/2/1/5 JMP REVIEW Open Access Sluggish cognitive tempo and its neurocognitive, social and emotive correlates: a systematic review of the current literature Anna Katharina Mueller1, Lara Tucha1*, Janneke Koerts1, Yvonne Groen1, Klaus W Lange2 and Oliver Tucha1 Abstract Objectives: Since the elimination of items associated with Sluggish Cognitive Tempo (SCT) during the transition from DSM-III to DSM-IV from the diagnostic criteria of Attention-deficit Hyperactivity Disorder (ADHD), interest in SCT and its associated cognitive as well as emotional and social consequences is on the increase. The current review discusses recent findings on SCT in clinical as well as community based ADHD populations. The focus is further on clinical correlates of SCT in populations different from ADHD, SCT’s genetic background, SCT’s association with internalizing and other behavioral comorbidities, as well as SCT’s association with social functioning and its treatment efficacy. Method: A systematic review of empirical studies on SCT in ADHD and other pathologies in PsycInfo, SocIndex, Web of Science and PubMed using the key terms “Sluggish Cognitive Tempo”, “Cognitive Tempo”, “Sluggish Tempo” was performed. Thirty-two out of 63 studies met inclusion criteria and are discussed in the current review. Results/Conclusion: From the current literature, it can be concluded that SCT is a psychometrically valid construct with additive value in the clinical field of ADHD, oppositional defiant disorder (ODD), internalizing disorders and neuro-rehabilitation. The taxonomy of SCT has been shown to be far from consistent across studies; however, the impact of SCT on individuals’ functioning (e.g., academic achievement, social interactions) seems remarkable. SCT has been shown to share some of the genes with ADHD, however, related most strongly to non-shared environmental factors. Future research should focus on the identification of adequate SCT measurement to promote symptom tailored treatment and increase studies on SCT in populations different from ADHD. Keywords: Sluggish cognitive tempo, ADHD, Genetics, Cognition, Social functioning, ADHD subtypes Review of Mental Disorders (DSM-IV and DSM-5) distinguishes Introduction three different subtypes of ADHD, namely ADHD com- The current literature review gives an overview about bined type (ADHD/C), ADHD predominantly inattentive the research performed on the concept of Sluggish Cog- (ADHD/I) or ADHD predominantly hyperactive/impul- nitive Tempo (SCT). SCT is a cognitive-emotional style sive (ADHD/HI) [6]. The transition from the 3rd to the that is commonly described by five typical characteris- 4th edition of the Diagnostic and Statistical Manual of tics, which are “daydreaming”, “being confused”, “staring Mental Disorders [7], however, led to the removal of blankly”, “being sluggish” and “being unmotivated” [1,2]. items representing sluggishness, easy confusion, and SCT was originally introduced in the literature on ADHD daydreaming from the inattention dimension of ADHD but is nowadays recognized in disorders different from [8] due to poor predictive validity [9]. Regardless of the ADHD as well [3-5]. The Diagnostic and Statistical Manual increasing interest in symptoms of sluggishness in ADHD during the last two decades [10-13] the current DSM-5 has not reintroduced the items representing * Correspondence: [email protected] a sluggish cognitive-emotive style. Based on recent psy- 1Department of Clinical and Developmental Neuropsychology, University of Groningen, Groningen, the Netherlands chometric findings, however, it is argued that the elim- Full list of author information is available at the end of the article ination of SCT symptoms during the transition from the © 2014 Mueller et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Mueller et al. Journal of Molecular Psychiatry 2014, 2:5 Page 2 of 13 http://www.jmolecularpsychiatry.com/content/2/1/5 DSM-III to the DSM-IV artificially increased ADHD’s Method homogeneity [14,15]. As a consequence, it is hypothe- A systematic review of the English published literature sized that some of the individuals who actually would of several databases (PsycInfo, SocIndex, Web of Science, havemetdiagnosticcriteriaofoneoftheADHDsub- PubMed) on the key terms “Sluggish Cognitive Tempo”, types are missed due to the elimination of SCT items. “Cognitive Tempo”, “Sluggish Tempo” revealed a total of Especially, ADHD/I has been frequently linked to 63 articles of which 32 (see Additional file 1: Table S1. symptoms such as, daydreaming, staring, mental foggi- Studies and measures employed) were closely related to ness, confusion, hypoactivity, sluggish or slow move- SCT and will be reviewed in here. Inclusion criteria were: ment, lethargy, apathy and sleepiness [6,15-19]. It is SCT was measured by questionnaire or observation and striking that the mentioned symptoms are very similar its relation to neuropsychological, emotional or social to items currently used in the measurement of SCT. In functioning was tested. The remaining 31 studies were not line with this, 30 to 50% of the children diagnosed with included in this review since SCT was not systematically ADHD/I have been shown to present with increased assessed or the focus was on age-related cognitive slowing levels of symptoms that emerged under the label SCT or learning (e.g., reading) ability and its relation to cogni- [20]. Based on the observation that approximately twice tive tempo. The majority (92%) of the studies focused on as many school-aged children are nowadays diagnosed SCT comorbid to ADHD symptoms as a personality trait with ADHD/I in contrast to ADHD/HI [21,22] and or clinical disorder. ADHD/I’s strong association with SCT, there is a need for a thorough definition of SCT’s cascading effects on Literature review individuals’ functioning. This being said, the current lit- Lack of standards in the measurement of SCT erature on SCT is rather inconsistent in terms of the Current studies on SCT predominantly focused on SCT definition and measurement of SCT. No consensus has in children and/or adolescents with either traits [11,26] been met, yet, with regard to symptomatology or stan- or clinical diagnoses of ADHD [10,27]. Only one study dardization in the assessment of SCT. Neurocognitive looked into SCT in adults with ADHD, examining impairments that are seen in children with ADHD/I hereby the association between self-rated SCT and ex- with comorbid SCT but not in children with pure ecutive functioning [16]. Initially, SCT was represented ADHD/I further show that even though SCT is very by four items (“difficulty following instructions”, “sluggish- similar to ADHD/I, SCT has its own neurocognitive ness”, “drowsiness”, “absent-minded, forgetful” [28]) characteristics [6,17,23,24]. A thorough look at the diag- that were then either reduced to two (“daydreams”, nostic validity of SCT and its impact on a variety of “is low of energy” [12,17,29-31]) or expanded up to 17 individuals’ functional domains seems therefore to be items in more recent studies [19,32,33]. warranted. Furthermore, given the heterogeneity in the Penny and colleagues [2] addressed the lack of agree- measurement of SCT and its inconsistency in the def- ment in standardised measures in SCT and came up inition of the concept SCT, treatment approaches of with a unique SCT questionnaire based on items that SCT are, so far, rather sparse. Yet, given the outlined have been shown to load highly on SCT in previous re- neurocognitive characteristics that are typical for SCT search [14,19]. An extensive review of the literature on but not ADHD [6,17,23,24], treatment that is inde- available items measuring SCT with subsequent reliabil- pendent of a possible comorbidity of ADHD seems to ity and factor structure analysis decreased the initial be important. The presence of SCT symptoms above pool of 26 items to a 14-item SCT scale (see Additional and beyond ADHD symptoms might be one of the me- file 1: Table S1 for individual items; [2]). In contrast to diating factors in treatment efficacy in psychiatrically Penny’s 14 item scale, Skirbekk and colleagues [33] com- referred individuals. pared the utility of Pfiffner and colleagues’ [32] 17-item During the process of the review another review on scale (SCT-17 see Additional file 1: Table S1 for individ- the same topic was published [25]. In contrast to Becker ual items) to a 5-item scale (SCT-5 see Additional file 1: [25] the current review discusses findings on SCT in Table S1 for individual items) by Hartman and col- adults, genetic studies, gender differences, SCT in disor- leagues [14] and showed that both scales capture the ders different than ADHD [3-5], specific treatment of concept of SCT [23,27,34] but add to Penny and col- SCT and stresses the current lack of standardization in leagues’ scale the dimensions of confusion [14] or forget- the assessment of SCT. Each section of this review will fulness (SCT-15 [32]). According to Penny and colleagues be dedicated to one of the functional domains that have [2], the items measuring the concept of confusion (i.e., for- been shown to be affected in individuals with SCT. It getfulness, disorganization and difficulty following ins- was our aim to dissect the unique contribution of SCT tructions) were explicitly removed as they are part of to impairments, whenever the reviewed studies’ designs the ADHD DSM-IV criteria and nowadays DSM-5 criteria allowed for such a conclusion. of inattention.
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