How anorexia nervosa patients with high and low autistic traits respond to group Cognitive Remediation Therapy


Background:
The current study aimed to evaluate group Cognitive remediation therapy (CRT) inpatients with Anorexia Nervosa (AN). We aimed to examine the treatment response of group CRT in AN patients with high or low levels of autistic traits.

Methods:
Thirty-five in patients with an AN diagnosis received group CRT intervention for 6 sessions in a national eating disorder unit. All participants completed self-report questionnaires on thinking styles and motivation before and after the intervention.

Results:
Patients with low autistic traits had statistically significant medium size effect improvements in self-reported thinking style scales as well as confidence (ability) to change. Patients with high autistic traits showed no statistically significant improvements in any outcome measure.

Conclusions:
The brief group format CRT intervention improves self-reported cognitive and motivational aspects in people with AN without autistic traits. For patients with higher autistic traits brief group CRT does not improve self-reported cognitive style or motivation. This finding suggests that brief group format CRT might not be the best suited format for individuals with elevated autistic traits and individual or more tailored CRT should be explored.

Keywords:
Anorexia nervosa, Autism spectrum disorders, Cognitive flexibility, Central coherence, Group therapy, CRT


Authors: Kate Tchanturia 1,2,3*;  Emma Larsson 1;  James Adamson 2
Authors place of work: King’s College London, Division of Psychological Medicine, Institute of Psychiatry, Psychology and Neuroscience, London SE5 8AF, UK. 1;  Eating Disorders Unit, South London and Maudsley NHS Foundation Trust, Beckenham, UK. 2;  Illia State University Tbilisi, Tbilisi, Georgia. 3
Published in the journal: BMC Psychiatry 2016, 16:334
Category: Research Article
doi: 10.1186/s12888-016-1044-x

© 2016 The Author(s).

Open access
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The electronic version of this article is the complete one and can be found online at: http://bmcpsychiatry.biomedcentral.com/articles/10.1186/s12888-016-1044-x

Summary

Background:
The current study aimed to evaluate group Cognitive remediation therapy (CRT) inpatients with Anorexia Nervosa (AN). We aimed to examine the treatment response of group CRT in AN patients with high or low levels of autistic traits.

Methods:
Thirty-five in patients with an AN diagnosis received group CRT intervention for 6 sessions in a national eating disorder unit. All participants completed self-report questionnaires on thinking styles and motivation before and after the intervention.

Results:
Patients with low autistic traits had statistically significant medium size effect improvements in self-reported thinking style scales as well as confidence (ability) to change. Patients with high autistic traits showed no statistically significant improvements in any outcome measure.

Conclusions:
The brief group format CRT intervention improves self-reported cognitive and motivational aspects in people with AN without autistic traits. For patients with higher autistic traits brief group CRT does not improve self-reported cognitive style or motivation. This finding suggests that brief group format CRT might not be the best suited format for individuals with elevated autistic traits and individual or more tailored CRT should be explored.

Keywords:
Anorexia nervosa, Autism spectrum disorders, Cognitive flexibility, Central coherence, Group therapy, CRT

Background

Recent evidence on the cognitive features of anorexia nervosa (AN) suggests problems in cognitive flexibility (ability to shift between strategies and adapt to changes in the environment) and central coherence (attention bias to detail vs bigger picture) [for large database and systematic reviews see [9, 21, 22]], Poor cognitive flexibility and weak central coherence are the most commonly reported cognitive characteristics for autism spectrum disorders (ASD) [systematic review see [27]]. Similarities between AN and ASD was first reported in Gillberg and colleague’s studies (e.g. [6]) and further supported with evidence from the last three decades [4, 8, 11, 28] in neuropsychological, social cognitive and other domains.

Cognitive Remediation therapy (CRT) for AN was adapted to target cognitive flexibility, bigger picture thinking, perfectionistic thinking styles, encourage reflection on thinking styles and use awareness of cognitive styles in real life situations. CRT in individual and group formats was developed for adults and young people as well as family interventions using cognitive training principles (e.g. [10, 25]). The Individual CRT format recently gained more evidence from randomised treatment trials consistently showing cognitive improvements in patients receiving CRT as well as broader aspects of recovery [24, 25]. CRT in group format is less studied and no randomised treatment studies are available at present (for more details see Table 1).

Tab. 1. Published studies using the group format CRT in the field of eating disorders
Published studies using the group format CRT in the field of eating disorders
Dflex detail and flexibility questionnaire, Cognitive Rigidity and Attention to Details subscales; CFS cognitive flexibility scale, MR motivational ruler, Importance to change and Ability to change subscales; d-effect size

From the published literature, variety of the session length and content as well as outcome measures makes it difficult to draw systematic conclusions [23] and further research is needed.

In this study we aimed to examine the effects of CRT in an adult inpatient programme for AN patients with and without ASD traits.

Methods

Participants

Thirty-five participants with a diagnosis of AN based on DSM-5 from one of the consultant psychiatrists at the national eating disorder adult service were included in our study. Participants took part in a CRT group called “Flexibility workshop” (this title was selected by inpatients on the ward and we have kept this title to respect patients choice). Cognitive flexibility is one of the main target areas for CRT and the flexibility workshop represents an important part of the work happening in the group. The group runs on an alternating basis with other psychological groups offered on the ward, therefore participants are at various stages of their treatment when offered to attend the group.

The CRT group (“Flexibility workshop”)

Data has been collected from multiple runs of the CRT group at an inpatient adult service for patients with severe AN. The groups are delivered by a multidisciplinary team with two facilitators per group, one of the facilitators is always a psychologist trained and supervised by the first author.

All sessions include practical, experiential exercises followed by reflection and discussion as well as psychoeducation about how the brain works, what we know about cognitive styles in AN and why we think flexibility workshop is useful in the recovery journey for patients [20]. Patients are also asked to plan their homework in the session together with facilitators. The facilitators aim to take a motivational and collaborative stance, by taking part in all the group exercises and planning of the homework tasks. The group explore different thinking styles, highlighting that there are pros and cons for each way of thinking but no right or wrongs. The first session involves psychological education about the brain and what research tells us about cognitive styles in eating disorders. The following sessions focus on multitasking, cognitive flexibility and bigger picture thinking, whereas the last session is focused on summarising the group by creating mind maps and relating the group content to the bigger picture of recovery. The group sessions in detail are described in the book outlining present research evidence and empirical findings [19, 23] and the clinicians manual [http://www.katetchanturia.com/publications].

Procedure

All patients admitted to South London and Maudsley NHS Foundation Trust’s inpatient service were welcome to take part in the group. All participants were given information about the group and signed consent forms. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

The group consisted of 6 weekly sessions, and each session lasted for an hour. Patients were asked to complete the questionnaires before starting the group and again after the final session with the satisfaction questionnaire completed at the end of the group. Each group was attended by a mean of 5 participants.

Self-report Measures were chosen to measure targeted cognitive aspects in the group intervention and included:

Detail and flexibility questionnaire (DFlex) [16]

The scale consists of 24 items assessing cognitive rigidity and attention to detail. The clinical cut off for the cognitive rigidity subscale is 53 and above, and 44 for the attention to detail subscale. The scale has displayed high internal reliability and construct validity in both subscales [16].

Motivational ruler (MR) [13]

The questionnaire consists of 2 items measuring participants’ self-rated importance and ability to change. The scores are ranging from 0 to 10 with higher scores indicate greater importance or ability respectively. The measure has been used successfully in previous evaluation of individual and group work.

Patient feedback questionnaire

After completing the group, patients were also given a satisfaction questionnaire where they were asked to rate on a 5-point Likert scale whether they found sessions enjoyable, useful, had learnt any new skills and their opinion about the length of the group. In addition to the 4 quantitative questions, there were 3 qualitative questions asking the patients what they liked most about the sessions, what could be improved, and other groups they had attended.

ASD measures

Participants were assessed by at least one of the following measures; Autism-Spectrum Quotient (AQ): AQ-10 [1] a 10 item self-report questionnaire or the Autism Diagnostic Observation Schedule (ADOS). ADOS is a semi-structured clinical assessment tool which was conducted by a trained researcher as part of a separate study conducted on the ward, whereas the AQ questionnaire is a self-reported measure routinely administered as part of patients’ admission package. The patients’ scores have been separated in to low and high groups according to the clinical cut-off scores for each measure 23 % of participants (N = 8) were not assessed with clinical interview ADOS and in this cases only self-report AQ was used.

Data analysis

Forty-nine patients took part in the first session of the group. 3 (6 %) of patients dropped out from the group; 11 patients (22 %) failed to complete or return both sets of questionnaires (these patients attended a different number of sessions). The remaining data (72 %) was examined for normality and afterwards each of the outcome measures from the first and final sessions of the group were analysed with paired t-tests using SPSS version 23. Repeated measures t-tests were then used to compare the between group’s performance over time in each of the clinical outcome variables. Cohen’s d effect sizes were computed for the all outcome measures [3].

Results

The mean age of the patients was 26.2 (SD = 7.7). Patient’s mean BMI at the first session was 15.8 (SD = 1.8). Mean age of onset 18.2 (SD = 6.8) with a mean illness duration of 8.6 years (SD = 6.5). There were no significant differences between the two groups on any of the demographic variables assessed.

Table 2 displays differences on the clinical outcome measures between patients scoring high or low on the ASD measures.

Tab. 2. Evaluating differences in outcome measures between low and high scores on ASD measures
Evaluating differences in outcome measures between low and high scores on ASD measures
n number of participants, Dflex detail and flexibility questionnaire, Cognitive Rigidity and Attention to Details subscales, CFS cognitive flexibility scale, MR motivational ruler, Importance to change and Ability to change subscales

Paired t-tests revealed that there were significant differences on the Cognitive Rigidity subscale of the DFlex in the low scoring ASD group, with a medium effect size after CRT group (p > 0.01, d = 0.5) and trend on attention to detail scale with small effect size. Furthermore, there was also a significant medium effect size difference observed on patients self-reported ability to change, in the low scoring ASD group (p > 0.01, d = 0.5). However, there were no significant differences on any of the scales within the high scoring ASD group with negligible effect sizes after brief group CRT. There were no significant differences in patients’ evaluation of the group between high and low scorers. In addition, there were no significant differences on the magnitude of change between the two groups on the Dflex cognitive flexibility or attention to details subscales [F (1,33) = 2.19, p > .05; F (1,33) = 3.32, p > .05, respectively], or participants’ motivation to change [F (1,32) = 1.47, P > .05]. However, a significant difference on the magnitude of change between the two groups was observed for participants’ self-reported ability to change [F (1,32) = 6.59, p = .02]. Figure 1 illustrates patients scores over time between the low and high ASD trait groups self-reported cognitive flexibility and attention to detail subscales.

Repeated measures T-tests: cognitive flexibility and attention to details subscales
Fig. 1. Repeated measures T-tests: cognitive flexibility and attention to details subscales

Discussion

Our main question in this small scale naturalistic case series was to explore similarities and differences in treatment response in patients with anorexia nervosa with and without ASD traits receiving CRT group therapy as part of their inpatient admission. Patients’ self-reported cognitive style, motivation to change and their feedback on the intervention were used as outcome measures.

From the previous literature, as presented in Table 1, group CRT was reported in different clinical settings (mostly case series and clinical observations) but no research to date has been conducted to explore the impact of group CRT in patients with both AN and ASD. This is an important question because research evidence shows clear links between AN and ASD (e.g. [4, 6, 8, 14, 26, 27]). Amongst other similarities between AN and ASD, set shifting and bigger picture thinking are well researched and since CRT targets cognitive style the group setting is an ideal and safe environment to practice experiential cognitive exercises and role plays. It is therefore a very relevant question to explore similarities and differences in response to CRT group therapy for these patient groups. In addition to this, inpatient treatment for severe and enduring AN needs more development in the area of psychological treatment according to multicentre studies e.g. [7].

Our findings from this observational study does not allow us to draw causal conclusions about the effect of group CRT, due to a lack of control group, but instead provides interesting observations and pilot data for future studies. For example, our findings suggest that the subgroup of inpatients with AN who had no ASD traits reported medium size statistically significant improvements in self perceived flexibility of thinking and seemed to have developed a bigger picture approach after the group CRT. Their self-reported ability to change was also higher after the intervention, interestingly this increase was significantly larger than the small increase found in the high ASD trait group. The feedback questionnaire showed overall satisfaction with the brief group format from both groups, with no significant differences in feedback between the groups (Fig. 2).

Patient feedback questionnaire
Fig. 2. Patient feedback questionnaire

This is an interesting finding as gaining insight into your own thinking patterns and being able to make changes and adaptations from a very early stage of treatment in an inpatient programme is helpful to engage patients in the treatment and make behavioural changes in different domains. In the context of inpatient psychological treatment, group interventions are practical and easy to deliver alongside nutritional and other inpatient treatment interventions [for more details see [18, 20] ‘Brief group psychotherapy for eating disorders: inpatient protocols’].

Our results also highlight that in the group of patients scoring high on one of the ASD measures (N = 14), no significant changes in self-reported thinking styles after group CRT or improvements in motivation; negligible effect sizes suggest that it is unlikely due to the power of study. From these results we can see that the current brief group format of CRT had no influence on self perceived cognitive styles. It is possible that the group setting, dosage or even style of delivery of the cognitive training could be modified for people with both AN and ASD traits.

In regards to the form of delivery of CRT, in AN literature the authors always highlight the importance of a motivational approach using Socratic questioning throughout the sessions moving from experiential exercises to reflective and implementation stages. This approach might be modified and adapted to suit an ASD/AN patient group making questions more concrete and giving more examples rather than expecting patients to do too much guess work and struggle with open ended questions. A recent systematic review of the CBT literature in ASD [17] has highlighted the need of protocol modifications for individuals with ASD. The authors presented useful recommendations to make CBT more accessible for the ASD group, similar adaptations are achievable for CRT.

Although this small case study is limited, it is informative and has useful implications when considering future developments, for example individual format of cognitive training will perhaps be more suited for people with comorbid ASD traits and AN. In future CRT studies, it is also worth exploring the proportion of comorbid ASD in AN samples, as the literature has shown that it is harder to diagnose women with ASD. Careful examination and clinical interviews will help detect a larger proportion of women in clinical settings with comorbid AN and ASD e.g. [11]. According to our results, inclusion or exclusion of an AN/ASD group might change results of other studies in the context of treatment evaluation. Our results suggest that the sub-group of patients with elevated ASD traits may need special adaptations of the available treatments in terms of length and content, not only to restore their nutrition, but to address wider aspects of recovery including addressing underlying anxiety and broader social functioning.

Our small observational study has a number of limitations for example the study was based on audit and a control group (non CRT group) will be needed in the future. Neuropsychological testing would also help to address the question around whether changes in thinking styles in the current study are subjective or reflective of improved cognitive test performance. It would also be worth addressing the role of co-morbidities, such as depression and anxiety, on cognitive change and treatment outcomes.

Conclusions

This small study has implications for future studies for example, it will be easier to design studies with a more accurate power calculation, taking into account ASD traits by developing a modified version of group CRT for the individuals with AN and ASD.

Abbreviations

ADOS: Autism diagnostic observation schedule; AN: Anorexia nervosa; AQ: Autism-spectrum quotient; ASD: Autism spectrum disorder; CRT: Cognitive remediation therapy; DFlex: Detail and flexibility questionnaire; MR: Motivational ruler

Acknowledgements

We would like to thank our patients for their informative feedback and active participation in the development of this therapeutic package.

Funding

Swiss Anorexia Foundation (34–16) and the Maudsley Charity “Health in Mind”.

Availability of data and materials

Data available from the corresponding author upon request.

Authors’ contributions

KT devised the therapy manual with clinical team, selected the outcome measures, supervised the study and drafted the manuscript. EL and JA collected the data and contributed to the writing of the manuscript. All authors have read and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

Not applicable.

Ethics approval and consent to participate

Ethical approval for the study was obtained from the NHS Ethics Committee (14/LO/2131). All participants in this study signed consent to participate and publish the study.

Received: 9 May 2016
Accepted: 19 September 2016
Published: 29 September 2016

* Correspondence:

Kate Tchanturia

1King’s College London, Division of Psychological Medicine,
Institute of Psychiatry, Psychology and Neuroscience,
London SE5 8AF, UK

2Eating Disorders Unit, South London and Maudsley NHS Foundation Trust,
Beckenham, UK

kate.tchanturia@kcl.ac.uk


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