In critical theory, sociology, and psychoanalysis, the gaze (translated from French le regard) is the act of seeing and being seen. Numerous existentialists and phenomenologists have addressed the concept of gaze beginning with Jean-Paul Sartre.
Body language, on the other hand, does not have a grammar system and must be interpreted broadly, instead of having an absolute meaning corresponding with a certain movement, so it is not a language like sign language, and is simply termed as a "language" due to popular culture.
Voluntary facial expressions are often socially conditioned and follow a cortical route in the brain. Conversely, involuntary facial expressions are believed to be innate and follow a subcortical route in the brain. Facial recognition is often an emotional experience for the brain and the amygdala is highly involved in the recognition process.
As mentioned above, her conception of haptic visuality stems from Riegl, Deleuze and Guattari; she expands on both the haptic/optical distinction and psychoanalytic accounts of the Gaze, offering application to contemporary media objects.
Full-text PDF on ResearchGate | This chapter focuses on the methodologies for coding behaviors in proxemics, kinesics (i.e. body and head movements), and gaze. The discussion in this chapter of methodological issues in body movement research is divided into two segments: body positions and body actions.