Attentional biases that underlie free-viewing perceptual asymmetries: Endogenous and exogenous effects in a behavioural/imaging study.

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As we move our eyes and attention around us, we are capable of interacting with any part of our immediate environment. It is intriguing, therefore, to discover that the upper and leftward features of an object are more salient than those on the bottom or right. By investigating the nature of these attentional biases in normal individuals, this research will improve our understanding of the thought processes and brain structures that control spatial attention. This research has important implications for the development of remedial programs for patients with attentional disorders. The test we use to measure attentional asymmetries has the potential to become an important tool for the early detection of clinical abnormalities in attention.