Transcranial Direct Current Stimulation (tDCS) paired with a decision-making task reduces risk-taking in a clinically impulsive sample.

BACKGROUND: Impulsivity is a multidimensional personality trait observed across a variety of psychiatric disorders. Transcranial direct current stimulation (tDCS) applied over dorsolateral prefrontal cortex (DLPFC) has shown promise as an intervention to reduce impulsivity. OBJECTIVE: To investigate the effects of tDCS paired with a decision-making task on risk-taking in Veterans with a clinical history of impulsive behavior. METHODS: This was a randomized, single-blind, sham-controlled study. Participants performed the Balloon Analogue Risk Task (BART) while concurrently receiving either active or sham tDCS (right anodal/left cathodal over DLPFC) twice a day for five days. To evaluate generalization, the Risk Task was performed before and after the complete course of intervention. To evaluate durability, the BART and Risk Task were administered again at one and two month follow-up sessions. RESULTS: Thirty Veterans participated: 15 received active tDCS and 15 received sham tDCS. For the trained BART task, individual growth curve analysis (IGC) examining individual variation of the growth rates over time showed no significant variations in individual trajectory changes over time (ß = 0.02, p > 0.05). For the untrained Risk Task, IGC showed that the active tDCS group had a significant 46% decrease in risky choice from pre-to post-intervention, which persisted through the one and two month follow-up sessions. The sham tDCS group showed no significant change in risky choice from pre-to post-intervention. CONCLUSIONS: tDCS over DLPFC paired with a decision-making task effectively reduced risk-taking behavior in a group of Veterans with clinically-relevant impulsivity. Results suggest that this approach may be an effective neuroplasticity-based intervention for patients affected by impulsivity.

The State of Sleep Medicine Education in North American Psychiatry Residency Training Programs in 2013: Chief Resident's Perspective.

OBJECTIVE: To assess the current state of sleep medicine educational resources and training offered by North American psychiatry residency programs. METHODS: In June 2013, a 9-item peer-reviewed Sleep Medicine Training Survey was administered to 39 chief residents of psychiatry residency training programs during a meeting in New York. RESULTS: Thirty-four percent of the participating programs offered an elective rotation in sleep medicine. A variety of innovative approaches for teaching sleep medicine were noted. The majority of the chief residents felt comfortable screening patients for obstructive sleep apnea (72%), half felt comfortable screening for restless legs syndrome (53%), and fewer than half were comfortable screening for other sleep disorders (47%). CONCLUSIONS: This is the first report in the last decade to provide any analysis of current sleep medicine training in North American psychiatry residency training programs. These data indicate that sleep medicine education in psychiatry residency programs is possibly in decline.

Nicotine withdrawal and craving in adolescents: effects of sex and hormonal contraceptive use.

While sex differences in the nicotine withdrawal (NW) symptoms and craving (NC) have been extensively described in adult cigarette smokers, few studies have investigated these phenomena in adolescents. We investigated the effect of gender and hormonal contraception (HC) on NW and NC during the first 14 days of cessation in adolescent smokers using data from a randomized, placebo-controlled, double-blind trial of the transdermal nicotine replacement therapy for smoking cessation. Analyses showed similar levels of NW severity in males and females, regardless of HC use. However, significantly higher NC was observed in females compared to males, (2.22+/-0.12 vs. 1.65+/-1.14; p=0.003). Further, females not using HC reported the highest level of NC (2.38+/-0.16) followed by females using HC (2.08+/-0.25) and males (1.71+/-0.16; p=0.007). The current findings suggest that adolescent females experience similar NW severity to males, but have stronger NC. Further, the use of hormonal contraceptives may impact the severity of craving. Addressing these different symptoms in adolescents may be useful in increasing smoking cessation rates in this special population of smokers.