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The hypothesis that misperception of an automobile's centerline is related to pedal error was tested in eight late-model automobiles. Pedal error is described as hitting the accelerator pedal when instructed to depress the brake pedal. One hundred twenty-nine subjects participated in an experiment in which pedal errors and perceived centerline were measured in all eight automobiles. The results indicate that subjects misperceive the centerline of the automobile to be to the right of the actual centerline. Although 26 pedal errors were recorded, no relationship between pedal errors and misperceived centerline was found.

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Perceptual adaptation to underwater size, distance, and curvature distortion was measured for four different adaptation conditions. These conditions consisted of (a) playing Chinese checkers underwater, (b) swimming with eyes open underwater, (c) viewing a square underwater, and (d) an air control. Significant adaptation to underwater distortions was recorded in all except the air control condition. In the viewing square condition a positive correlation between size and distance adaptation was noted. It was suggested that adaptation to curvature may have mediated the positive correlation. Possible applications for the training of divers are discussed.

The curvature distortion perceived under water was measured in three dimensions before and after 15 min of adaptation to the underwater environment. Subjects initially perceived distortions in all three dimensions. After 15 min under water, they exhibited significant adaptation to the curvature distortion in all dimensions. The type of task performed while in the water did not significantly affect the amount of adaptation. The results are compared with those of previous experiments which have reported evidence of counteradaptation when more than one kind of adaptation is measured simultaneously.