Table 1.

Common properties of crowding and surround suppression.

Property	Crowding	Surround suppression
Peripheral locus	Flom et al. (1963); Bouma (1970)	Andriessen and Bouma (1976); Snowden and Hammett (1998)
Radial–tangential anisotropy	Toet and Levi (1992)	Petrov and McKee (2006)
Orientation tuning	Levi et al. (2002)	Andriessen and Bouma (1976); Petrov et al. (2005)
Spatial frequency tuning	Chung et al. (2001)	Petrov et al. (2005)
Extent scales with eccentricity	Bouma (1970); Toet and Levi (1992)	Petrov and McKee (2006)
Extent does not depend on size	Strasburger et al. (1991); Tripathy and Cavanagh (2002)	Petrov and McKee (2006)
Saturates at high mask contrasts	Pelli et al. (2004)	Snowden and Hammett (1998); Petrov et al. (2005)