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Face span

From EverybodyWiki Bios & Wiki

The “'Face Span”' or ”'Facespan”' is a face processing concept referring to the minimal spatial extent of information in visual angle (vertically and horizontally) that the visual system requires to perform face processing. This concept derived from the Vision span evaluated in reading by McConkie & Rayner [1] using a Gaze-contingency paradigm. The Facespan and the Vision span both lie on the fact that most of human visual field is peripheral vision and is at the highest resolution in the macula where the density of cone cells is high.

The Facespan was first evaluated in the field of face recognition[2] using a gaze-contingent moving window—a Spotlight—to reveal a small amount of facial information. The Facespan for face recognition represents the minimal spatial extent of information required by the face-processing system in order to perform face recognition as good as in natural viewing conditions. The Facespan was evaluated to 7 ° of visual angle or 45% of the face [2]

Application to face processing[edit]

Face recognition system requires several fixation on different location for a face to be recognised. The same is true for the so-called Super Recognisers who are persons with high face recognition capabilities. However, and similarly to the reading span, the Facespan is modulated by difficulty [3], expertise [4], age [5], disorder [6] and other idiosyncratic differences between individuals. The idiosyncratic differences are thus mostly due to differences in Facespan rather than in oculomotor strategy. Previous study [7] revealed that the Vision span is more accurately defined in number of characters rather than in visual angle.


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