Topography can provide objective measures of consumption behavior patterns in fine grained detail. While it has been widely used in tobacco research, alcohol topography has not been well-studied. Smoking topography has been shown to provide indicative information for nicotine dependence. The investigators hypothesize that alcohol topography can also be used as an objective measure indicative of alcohol use disorder. In this project, the investigators propose to conduct a video-assisted drinking topographical study. The main objectives of this study include: (1) characterize drinking behavioral patterns by converting videotaped drinking episodes into various drinking related parameters (e.g., sipping frequency, sipping interval, sipping duration, rest duration, sipping amount, and etc.); (2) compare drinking behavioral patterns across groups defined by drinking status (social vs. heavy drinkers) and mental health status (depressed vs. non-depressed); and (3) use advanced nonlinear modeling to quantify the behavioral pattern and to derive potential indicators for alcohol use disorder.