Two experiments, with 16 university students, revealed that errors of identification for
alphanumeric characters increased approximately linearly with increased angular deviation …

Abstract Effects of orientation on identification can be attenuated when other patterns at the
same (or a similar) orientation are identified in close temporal contiguity. In Experiments 1 …

Visual recognition of patterns reflected or rotated through 180 (point-inverted) depends
critically on their positional symmetry and separation in the field. A possible explanatory …

Conducted 3 experiments with a total of 36 right-handed 18-25 yr olds with normal or
corrected vision. Ss decided as quickly as possible whether dot patterns were or were not …

Can subjects voluntarily set an internal coordinate frame in such a way as to facilitate the
detection of symmetry about an arbitrary axis? If so, is this internal coordinate frame the …

Subjects viewed pairs of random-dot patterns which were presented in a number of
arrangements varying in the transformations applied to the patterns, in the distance between …

Relatively little attention has been paid in the experimental literature of form-perception to
the changes in the nature of the percept which the mere factor of orientation may evoke. This …

Ss classified a test form as matching or not matching one of a set of memorized forms
relative to which the test forms were rotated up to 90 deg.“Match” reaction times increased …

Experimental design. The basic series in the experimental program was thus designed to
investigate quantitatively the effects on precision of discrimination of direc tion brought about …

Subjects judged whether two visual patterns had the same shape under conditions in which
the patterns could vary orthogonally in size and orientation. Analyses of reaction times and …