Martin Szinte e Patrick Cavanagh, Apparent Motion from Outside the Visual Field, Retinotopic Cortices May Register Extra-Retinal Positions, in PLOS ONE, 15 October 2012, DOI:10.1371/journal.pone.0047386. URL consultato il 9 novembre 2014.
«With our head and eyes steady, our normal binocular vision covers a visual field of about 200 to 220 degrees of visual angle.»