“…These demonstrations support our conclusion that monkeys can use illusory forms as a basis for psychophysical discriminations, and are consistent with data from previous studies of this kind using illusory boundaries (De Weerd et al, 1996; Huxlin et al, 2000). Furthermore, they lend an additional dimension to a growing body of literature showing similarities between macaques and humans on a range of global form tasks, such as contour integration (Kiorpes & Bassin, 2003), Glass pattern integration (Kiorpes & Movshon, 2003; Kiorpes, 2006), and, more generally, object recognition independently of orientation, occlusion, and other transformations (Kovacs, Vogels, & Orban, 1995; Schiller, 1995; Logothetis & Sheinberg, 1996; Sigala & Logothetis, 2002; Sigala, Gabbiani, & Logothetis, 2002; Matsuno & Fujita, 2009). Further reinforcing these similarities, Fujita (2001) showed that rhesus monkeys and humans observe similar perceptual biases on overestimation of length illusions, while other studies in a chimpanzee (Sato, Kanazawa, & Fujita, 1997) and capuchin monkeys (Fujita & Giersch, 2005) provided evidence for perception of partly occluded figures when two rod halves shared the same alignment and/or direction of movement.…”