sigyn: (Norse mythology) wife of Loki; held a cup over him during his punishment to spare him the pain of drops of poison
psychological feature: a feature of the mental life of a living organism
fluoxetine: a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade names Prozac or Sarafem); it is thought to work by increasing the activity of serotonin in the brain