title: Effects of tilted orientations and face-like configurations on visual search asymmetry in macaques.
abstract: Visual search asymmetry has been used as an important tool for exploring cognitive mechanisms in humans. Here, we examined visual search asymmetry in two macaques toward two types of stimulus: the orientation of line stimuli and face-like stimuli. In the experiment, the monkeys were required to detect an odd target among numerous uniform distracters. The monkeys detected a tilted-lines target among horizontal- or vertical-lined distracters significantly faster than a horizontal- or vertical-lined target among tilted-lined distracters, regardless of the display size. However, unlike the situation in which inverted-face stimuli were introduced as distracters, this effect was diminished if upright-face stimuli were used as distracters. Additionally, monkeys detected an upright-face target among inverted-face distracters significantly faster than an inverted-face target among upright-face distracters, regardless of the display size. These results demonstrate that macaques can search a target efficiently to detect both tilted lines among non-tilted lines and upright faces among inverted faces. This clarifies that there are several types of visual search asymmetry in macaques.
authors: Department of Integrative Neuroscience, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan .
authors: Ryuzaburo
authors: R
authors: Nakata
authors: Satoshi
authors: S
authors: Eifuku
authors: Ryoi
authors: R
authors: Tamura
mesh_terms: D000818:Animals; D005145:Face; D005260:Female; D008251:Macaca / Q000502:physiology / Q000523:psychology*; D008297:Male; D009949:Orientation; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation; D011187:Posture; D011930:Reaction Time