We assessed the influence of a ''video doctor's'' affective communicat
ion style (warm vs. neutral) and of a preamble to questions about sexu
al activity on patients' disclosure of risky sexual behavior and injec
table drug use. To isolate the effects of the independent variables, w
e created an interactive multimedia program for HIV risk assessment us
ing a video doctor portrayed by an actor. Participants were assigned t
o one of four conditions: no preamble and a neutral physician, no prea
mble and a warm physician, a preamble and a neutral physician, or a pr
eamble and a warm physician. Almost 60% of a convenience sample of 393
subjects reported engaging in two or more risky behaviors. Disclosure
of risky behaviors was not significantly affected by the preamble. A
warm communication style elicited more disclosure than a neutral style
, suggesting that physicians' communication style is important in dete
rmining how much sensitive information patients are willing to reveal.