title: Neurophysiological correlates of borderline personality disorder: a transcranial magnetic stimulation study.
abstract: BACKGROUND
  Cortical inhibition deficits have been demonstrated in several disorders with deficits in impulsive control (e.g., attention-deficit/hyperactivity disorder [ADHD], tic disorder, Tourette syndrome) by using transcranial magnetic stimulation (TMS). With borderline personality disorder (BPD), we investigated another disorder associated with high impulsivity by TMS. We hypothesized that BPD patients display decreased cortical inhibition and/or increased cortical excitation as assessed with TMS.
  
  
  METHODS
  Different inhibitory and excitatory TMS parameters were investigated in 19 unmedicated female BPD patients and 19 healthy control subjects matched for sex, age, handedness, and body height. Additionally, the results were controlled for ADHD symptomatology.
  
  
  RESULTS
  A reduced cortical silent period (CSP) duration was found in BPD patients compared with healthy control subjects in the right cortex. Even after controlling for ADHD symptoms, this result remained significant.
  
  
  CONCLUSIONS
  These findings support an association between BPD and cortical inhibition deficits as indexed through TMS. The results are discussed considering basic neurobiological mechanisms that may explain our findings of decreased intracortical inhibition in BPD patients.
authors.affiliation: Department of Clinical Psychology and Psychotherapy, Ruprecht-Karls University of Heidelberg, Heidelberg, Germany. sven.barnow@psychologie.uni-heidelberg.de
authors.forename: Sven
authors.initials: S
authors.lastname: Barnow
authors.forename: Kathleen A
authors.initials: KA
authors.lastname: Völker
authors.forename: Bertram
authors.initials: B
authors.lastname: Möller
authors.forename: Harald J
authors.initials: HJ
authors.lastname: Freyberger
authors.forename: Carsten
authors.initials: C
authors.lastname: Spitzer
authors.forename: Hans J
authors.initials: HJ
authors.lastname: Grabe
authors.forename: Zafiris J
authors.initials: ZJ
authors.lastname: Daskalakis
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001289:Attention Deficit Disorder with Hyperactivity / Q000503:physiopathology / Q000523:psychology; D001883:Borderline Personality Disorder / Q000503:physiopathology* / Q000523:psychology*; D004569:Electroencephalography; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D011569:Psychiatric Status Rating Scales; D050781:Transcranial Magnetic Stimulation; D055815:Young Adult