1. A method for determining a measure of engagement by an individual with respect to a stimulus, comprising the steps of: receiving blink data indicative of the individual's blink responses to the stimulus; synchronizing, via software executing on a processor, the received blink data with the stimulus; identifying, via software executing on the processor, a pattern of blink inhibition in the synchronized blink data; and comparing, via software executing on the processor, the pattern of blink inhibition in the synchronized blink data with the stimulus to identify a portion of the stimulus contemporaneous with the pattern of blink inhibition, whereby the pattern of blink inhibition indicates a marker of engagement by the individual with the contemporaneous portion of the stimulus.