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Visual Perception and the Pop-Out Effect

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Cognitive Neuropsychology (psy2010s) | Visual Perception and the Pop-out Effect | Tutorial 1 Assignment | | Zondi Londiwe (ZNDLON002) | 8/30/2013 |

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INTRODUCTION

Visual information is constantly presented to humans by the environment, and at times this can be far more than can be processed or needed. It is visual attention that allows the most relevant information for behaviour adjustment to be selected. Searching for particular objects that determine our actions whilst ignoring other competing objects can take long, especially if the objects all share common features. A number of theories that explain the process of visual search have been presented throughout the years. However the most common is the Feature Integration Theory developed by Treisman & Gelade (1980).

According to The feature integration theory, visual search happens in a two-stage process, the pre-attentive stage and the attentive stage. The pre-attentive stage is the basic stage of visual search where only basic features, such as the size, colour and orientation, of an object are processed (Treisman, 1988; Treisman & Galade, 1980). At this stage no focused attention is required because all the objects in the visual stimulus are processed in parallel. The second stage requires more attention as the search becomes serial i.e. each object is processed independently ((Treisman & Gelade, 1980). Also, parallel searching takes less time than serial searching.

Parallel and serial processing are further explained by the Pop- out effect. In searches where the target is surrounded by objects with dissimilar features, it is easier to spot it because it “pops out”. Whereas, it is more difficult when the target is surrounded by similar objects because then a serial search is required to identify the object (Treisman and Gormican, 1988; Egeth & Dag,enbach, 1991). Duncan (1985) adds

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