Research Paper on:
Contour Completion and Relative Depth: Petter’s Rule and Support Ratio

Unformatted Sample Text from the Research Paper:
Relative Depth: Petters Rule and Support Ratio" has the aim of investigating the way in which partially obscured objects are interpreted by the brain and the perceptions of a complete  objected is created. There are two approaches already in the literature; Petters Rule and the support-ratio rule. Petters rule states "Human vision prefers to make modal completions (i.e., illusory contours)  as short as possible", the support-ratio rule states " Human vision prefers modal completions with higher support ratios". The paper uses these rules as the basis for the study,  looking at the way in which modal contours are predicted in conditions where there is a homogenous coloured image and to assess if amodal completion is most accurately described with  Petters rule or the support-ratio rule. In each rule there are differing explanations given for the way in which the amodal completion process takes place. There are similarities, both  are scale invariant, the man difference between the two rules is the way that the support ratio rule uses the supporting edge lengths, whereas Petters rule does not, Petters rule  only utilises the gap lengths that are to be interpolated. By examining the sue of both rules in a practical assessment the aim is to determine the level of the  contribution of each rule in the determination of the completion and relative depths are assessed in shapes of homogenous colour. 1.2 Methods The method used involved 12 test subjects,  all of which were psychology students at the University of California, Irvine who volunteered in return for extra credit. Homogenous colour shapes cross shapes were presented to the subjects  on a computer screen with a resiltion of 1024 x 786. The subjects, seated 0.5 meters from their computer screen, were shown the shapes, they were told that they would