Mental state data useful for determining mental state information on an individual, such as video of an individual's face, is captured. Additional data that is helpful in determining the mental state information, such as contextual information, is also determined. Intermittent mental state data is interpolated. The data and additional data allow interpretation of individual mental state information. The additional data is tagged to the mental state data. At least some of the mental state data, along with the tagged data, is analyzed to produce further mental state information. A mood measurement is a result of the analysis.
