20. The system of claim 2 , further comprising: a presentation module configured to present the data indicative of the inferred mental state of the authoring user.
2. A system comprising: one or more sensors configured to sense one or more physical characteristics of an authoring user, wherein said one or more sensors configured to sense one or more physical characteristics of an authoring user, comprises: a functional near infrared (fNIR) device; an acquisition module configured to acquire data indicative of an inferred mental state of the authoring user based, at least in part, on the one or more physical characteristics sensed by the one or more sensors; and an association module configured to associate the data indicative of the inferred mental state of the authoring user with an electronic message.