Publications [#252092] of Ahmad Hariri

Journal Articles

1. Heinz, A; Smolka, MN; Braus, DF; Wrase, J; Beck, A; Flor, H; Mann, K; Schumann, G; Büchel, C; Hariri, AR; Weinberger, DR (2007). Serotonin transporter genotype (5-HTTLPR): effects of neutral and undefined conditions on amygdala activation.. Biological psychiatry, 61(8), 1011-1014.
   (last updated on 2024/04/24)

   Abstract:
   

   Background

   A polymorphism of the human serotonin transporter gene (SCL6A4) has been associated with serotonin transporter expression and with processing of aversive stimuli in the amygdala. Functional imaging studies show that during the presentation of aversive versus neutral cues, healthy carriers of the short (s) allele showed stronger amygdala activation than long (l) carriers. However, a recent report suggested that this interaction is driven by amygdala deactivation during presentation of neutral stimuli in s carriers.

   Methods

   Functional MRI was used to assess amygdala activation during the presentation of a fixation cross or affectively aversive or neutral visual stimuli in 29 healthy men.

   Results

   Amygdala activation was increased in s carriers during undefined states such as the presentation of a fixation cross compared with emotionally neutral conditions.

   Conclusions

   This finding suggests that s carriers show stronger amygdala reactivity to stimuli and contexts that are relatively uncertain, which we propose are stressful.