The Relationships between Online Game Player Biogenetic Traits, Playing Time, and the Genre of the Game Being Played.

Objective: Psychobiological traits may be associated with excessive Internet use. This study assessed the relationships between biogenetic traits, the amount of time spent in online game playing, and the genre of the online game being played.

Methods: Five hundred sixty five students who enjoyed one of the four types of games included in this study were recruited.

Effects of brain-derived neurotrophic factor-catecholamine-O-methyltransferase gene interaction on schizophrenic symptoms.

The methionine variant of Val66Met brain-derived neurotrophic factor BDNF met and catecholamine-O-methyltransferase (COMT L) is associated with a deficit in attention and aggravation of delusions in schizophrenia. We hypothesized that the BDNF-COMT gene interaction would affect the symptoms and cognition in schizophrenia. Ninety-six schizophrenic patients and 79 control participants were recruited.

Activation of extracellular signal-regulated kinase signaling by chronic electroconvulsive shock in the rat frontal cortex.

The effects of chronic electroconvulsive shock (ECS), given daily for 1, 5 and 10 days, on the activation of extracellular signal-regulated kinase (ERK) were studied in the rat frontal cortex. The phosphorylation of MEK1/2 and ERK1/2 increased through 5 days of ECS. Thereafter, a plateau was achieved.

Effects of catechol-O-methyltransferase Val158Met polymorphism on the cognitive stability and aggression in the first-onset schizophrenic patients.

We assessed catechol-O-methyltransferase (COMT) polymorphism in 132 first-onset schizophrenic patients and 80 healthy controls. The relationship between COMT polymorphism and cognitive function, aggression and psychiatric symptoms was tested in the schizophrenic group. COMTL carrier had higher digit span score and lower similarity score than COMTH homozygote.

Association of aggressive behavior in Korean male schizophrenic patients with polymorphisms in the serotonin transporter promoter and catecholamine-O-methyltransferase genes.

The incidence of aggressive behavior in patients with schizophrenia is higher than in the general population. Among particular gene polymorphisms posited to be involved in psychiatric disorders, the catecholamine-O-methyltransferase (COMT) and serotonin transporter (5-HTTPR) genes have been the focus of recent research on aggression. In this study, we hypothesized that both the COMT and the 5-HTTPR genotypes may be dependent on and related to aggression in Korean patients with schizophrenia.