1. A method for measuring engagement comprising: presenting a first set of stimuli to a first subset of a first set of subjects in a first environment; capturing neural data from the first set of subjects; capturing environmental data from the first environment; wherein environmental data comprises at least one of ambient temperature data and ambient lighting data; presenting the first set of stimuli to a second subset of the first set of subjects in a second environment; capturing environmental data from the second environment; wherein environmental data comprises at least one of ambient temperature data and ambient lighting data; calculating a first set of neural similarities between each possible pairing of subjects of the first set of subjects; and generating a first measure of engagement from the first set of neural similarities; wherein generating the first measure of engagement comprises weighting neural similarities of the first set of neural similarities according to captured environmental data.