ED - could training executive function improve treatment outcomes for eating disorders

10 important questions on ED - could training executive function improve treatment outcomes for eating disorders

ED: neurocognitive deficits in eating disorders

  • many deficits in EF
  • deficits in set-shifting (cognitive flexibility)
  • deficits in central coherence
  • working memory
  • additionally, poor inhibitory control has been observed in BED
  • these traits are probably causal instead of consequential

ED: Neurocognitive training for related conditions

  • psychiatric illness is associated with dysfunction across prefrontal fronto-limbic and fronto-striatal neural systems
  • these systems are associated with a diverse range of cognitive functioning including perception, cognition, social interactions, emotion, regulation, and motivation
  • these functions can be trained
  • more research necessary if training can extend to real life situations, and the only approach that has been tested with ED is cognitive remediation therapy (CRT)

ED: description of CRT

  • is designed as an complementary therapy
  1. encouraging retention of primary therapy
  2. decreasing cognitive rigidity, and improving flexibility
  • can be given in group or personal therapy
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ED: preliminary data

  • mixed results, medium/large effect sizes in improvement of cognitive flexibility
  • minimal support for the long-term transfer of such improvements

ED: limitations of existing research on CRT

  1. lack of control groups which raises concerns regarding confounds
  2. is the improvement only visible in the CRT task or also in the primary therapy/real life
  3. improvement in cognitive flexibility may also be attributable to weight gain
  4. is there a long-term effect of CRT?

ED: extending neurocognitive training paradigms for treatment of conditions related to ED

  • extensive drill and practice exercises are the most effective in improving deficits in CRT
  • computer based training can enhance CBT
  • tests can be given by a computer

ED: cognitive flexibility training

  • flexibility training may generate alternatives to rigid food and exercise rules
  • according to MDD therapy, flexibility training is only effective in combination with psychotherapy
  • a combination of computer training and clinician-guided therapy may have the most benefit

ED: inhibitory control training (ICT)

  • food-cue-specific ICT paradigms have shown preliminary efficacy at reducing impulsive responses to visual cues for highly palatable foods
  • training can also be used to used to increase inhibition for trigger items
  • mixed results, other studies found no transfer effect, or an increase in impulsivity
  • cue specific ICT has been show to facilitate weight loss
  • long-term effects are unknown
  • more research is necessary for BED and BN since thay operate under a egative affective state 

ED: working memory training

  • a deficit in the working memory may leave patients preoccupied with food or negative thoughts
  • working memory training has shown to reduce behavioural impulsivity during decision making-tasks in individuals with stimulant dependence
  • effective training paradigms for substance use are likely to be effective for EDs if appropriately for AN, BN

ED: Future directions

  • impairments in EF are related to the development and maintenance of eating disorders
  • CRT shows promise, but more research is needed
  • the putative mediators (set-shifting central coherence) of CRT have yet tor be formally tested, CRT might be operating through a mechanism other than improving cognitive flexibility
  • CRT and other training programs may be the most beneficial for those with more prominent deficits
  • there is little knowledge over the dosis and duration of CRT and other cognitive trainings, but they must occur daily and for a long time

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