In one exemplary embodiment, a computer-implemented method of generating an implicit social graph includes receiving an eye-tracking data associated with a word. The eye-tracking data is received from a user device. The word is a portion of a digital document. The eye-tracking data comprises at least one fixation period of substantially seven-hundred and fifty milliseconds and at least one regression from another portion of the digital document to the word. A comprehension difficulty of the word is determined based on the eye-tracking data. One or more attributes to a user of the user device is assigned, by one or more processors based on the comprehension difficulty, wherein the one or more attributes are determined based on a meaning of the word. An implicit social graph is generated based on the one or more attributes.
METHOD AND SYSTEM OF GENERATING AN IMPLICIT SOCIAL GRAPH FROM BIORESPONSE DATA