title: Object-based attention occurs regardless of object awareness.
abstract: In this study, we investigated whether awareness of objects is necessary for object-based guidance of attention. We used the two-rectangle method (Egly, Driver, & Rafal, 1994) to probe object-based attention and adopted the continuous flash suppression technique (Tsuchiya & Koch, 2005) to control for the visibility of the two rectangles. Our results show that object-based attention, as indexed by the same-object advantage--faster response to a target within a cued object than within a noncued object--was obtained regardless of participants' awareness of the objects. This study provides the first evidence of object-based attention under unconscious conditions by showing that the selection unit of attention can be at an object level even when these objects are invisible--a level higher than the previous evidence for a subliminally cued location. We suggest that object-based attentional guidance plays a fundamental role of binding features in both the conscious and unconscious mind.
authors.affiliation: Department of Psychology, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, Taiwan.
authors.forename: Wei-Lun
authors.initials: WL
authors.lastname: Chou
authors.forename: Su-Ling
authors.initials: SL
authors.lastname: Yeh
mesh_terms: D001288:Attention; D001364:Awareness; D003463:Cues; D006801:Humans; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation; D011930:Reaction Time