06 Anxiety

Theta2 against anxiety

Table of Contents

Theta2 is more common in extroverts with low traits of neurosis and anxiety. For this reason, Mizuki (1987) studied centrally acting drugs on college students to determine if differences in anxiety levels and performance existed between Theta2 producers and non-producers. Diazepam, amobarbital, methylphenidate, and a placebo were evaluated. The State Anxiety Scale of Speilberger's State 7Yait Anxiety Inventory (STAI) was used to measure anxiety The mental task was arithmetic addition.
Beta power increased and Theta power decreased after administration of all drugs, though not with the placebo. In the Theta2 group, the placebo increased the appearance time of Theta2, decreased anxiety scores, and increased task performance. Diazepam increased Theta2 and decreased anxiety, but did not influence task performance. Amobarbital did not change the appearance of Theta2 or anxiety, but decreased task performance slightly. Methylphenidate failed to influence the appearance of Theta2, but did increase anxiety slightly and markedly increased task performance. In the nonTheta2 producers, Theta2 appeared with drug administration even though these subjects had not previously shown Theta2 over three days of testing. The appearance time of Theta2 increased in the following order: diazepam > amobarbital > placebo > methylphenidate. Anxiety scores decreased .in the same order. Task performance increased with methylphenidate and the placebo, but decreased with amobarbital and diazepam. The Mizuki study suggests that Theta2 is related to task performance and that decreased anxiety might occur with the appearance of Theta2.