Visual Search

Visual Search

2018 | JEREMY M. WOLFE
The chapter discusses the reasons for visual search and the limitations that make it necessary. It highlights the uneven processing within the visual field, the decline in resolution as one moves away from the fovea, and the crowding effect, which makes it difficult to identify targets in peripheral vision. The chapter also introduces the concept of the binding problem, where different features of an object must be bound together to form a coherent representation. This binding process requires attention, which is a limited resource. The chapter further explores the nature of preattentive and attentive processing, the role of spatially selective visual attention, and the efficiency of different search tasks. It reviews classic visual search tasks, including accuracy methods, RT methods, eye movement methods, and electrophysiological measures, and discusses the continuum of search efficiency, guided by the ability to direct attention and the speed of rejecting distractors. The chapter concludes with a list of attributes that guide attention, such as color, motion, orientation, and size, and notes the ongoing debate about the exact nature of these guiding attributes.The chapter discusses the reasons for visual search and the limitations that make it necessary. It highlights the uneven processing within the visual field, the decline in resolution as one moves away from the fovea, and the crowding effect, which makes it difficult to identify targets in peripheral vision. The chapter also introduces the concept of the binding problem, where different features of an object must be bound together to form a coherent representation. This binding process requires attention, which is a limited resource. The chapter further explores the nature of preattentive and attentive processing, the role of spatially selective visual attention, and the efficiency of different search tasks. It reviews classic visual search tasks, including accuracy methods, RT methods, eye movement methods, and electrophysiological measures, and discusses the continuum of search efficiency, guided by the ability to direct attention and the speed of rejecting distractors. The chapter concludes with a list of attributes that guide attention, such as color, motion, orientation, and size, and notes the ongoing debate about the exact nature of these guiding attributes.
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