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Gratings appear of higher spatial frequency when they are viewed peripherally rather than foveally. To test the hypothesis that this effect is an artefact of particular laboratory conditions, we manipulated the contrast, luminance and presentation duration, manipulations which have also been shown to increase the apparent spatial frequency of foveally presented gratings. It has been argued that such...
By detection of spatial offsets is meant the ability to indicate whether or not a given (vernier) stimulus has a spatial offset. Discrimination, on the other hand, implies that the direction of offset has been correctly identified. We compared vernier thresholds for these two tasks and found a consistent difference by a factor of around 2 in favour of discrimination. This is to say that observers...
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