There is much to be known still about the effect of androgens on cognitive function, mood, personality, and behavior. I've seen substantial clinical evidence that androgens most definitely affect mood, personality, and behavior. Androgens may also promote a psychological disturbance known as MANIA, which can include symptoms of mild psychosis, such as delusions of grandiose or paranoia and increased "rate" of thoughts.
Be careful my friends, especially those who are genetically prediposed to mental illness.