Book excerpt: It takes little or no effort for us to gather information by means of our senses but it would be a mistake to take this as a sign that perception is simple. It was in the 20th century and after the establishment of psychology as a scientific discipline that the study of perception flourished. This important volume gathers together a selection of articles and essays which represent some of the most interesting discoveries and theories. It gives a flavour of the many different approaches and ideas taken by cognitive psychologists in this fascinating area. Topics covered include: attention, brain systems, object interpolation and completion, object recognition and classification, different types of objects, and information processing and models.