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  • Title: Do cognitive measures of response inhibition differentiate between attention deficit/hyperactivity disorder and borderline personality disorder?
    Author: van Dijk F, Schellekens A, van den Broek P, Kan C, Verkes RJ, Buitelaar J.
    Journal: Psychiatry Res; 2014 Mar 30; 215(3):733-9. PubMed ID: 24418050.
    Abstract:
    This study examined whether cognitive measures of response inhibition derived from the AX-CPT are able to differentiate between adult attention deficit/hyperactivity disorder (ADHD), borderline personality disorder (BPD), and healthy controls (HC). Current DSM-IV-TR symptoms of ADHD and BPD were assessed by structured diagnostic interviews, and parent developmental interviews were used to assess childhood ADHD symptoms. Patients (14 ADHD, 12 BPD, 7 ADHD and BPD, and 37 HC) performed the AX-CPT. Seventy percent of AX-CPT trials were target (AX) trials, creating a bias to respond with a target response to X probes in the nontarget (AY, BX, BY) trials. On BX trials, context, i.e. the non-'A' letter, must be used to inhibit this prepotent response tendency. On AY trials context actually causes individuals to false alarm. The effects of ADHD and BPD on AX-CPT outcome were tested using two-way ANOVA. BPD was associated with higher percentage of errors across the task and more errors and slower responses on BX trials, whereas ADHD was associated with slower responses on AY trials. The findings suggest response inhibition problems to be present in both ADHD and BPD, and patients with BPD to be particularly impaired due to poor context processing.
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