The effective detection of those facial expressions that alert us to a possible threat is adaptive. Hence the reason that studies on face sampling have involved analysing how this process occurs, with evidence to show that the eyes focus mainly on the upper side of the face; nevertheless, no clear determination has been made of the relationship between the efficacy in detection (speed and accuracy) and the way in which emotions are visually tracked on the face. A sequential priming task was therefore held in which the four quadrants of the face were displayed consecutively, for 50 ms each one, and in a different order (24 sequences). The results reveal a quicker response when the priming sequence begins in the upper part, continues downward to the right-hand side of the face, and then follows an anti-clockwise direction. The results are discussed in the light of studies using the Eye-Tracking technique.

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