this offers a unifying interpretation for why , at threshold conditions , the high spatial frequency portion of the image is blurred as severely by the nervous system as it is by the optics ( e.g . campbell and green , 1965 ) while in extreme suprathreshold conditions the nervous system effectively deblurs the image ( e.g . georgeson and sullivan , 1975 ; kulikowski , 1976 ) .
C0459471
interpretation
C0027763
nervous