
doi: 10.3758/bf03330486
A threshold-like nonlinearity was found in a mental rotation experiment designed for relatively heavy sampling of small angular disparities. The value of the threshold in this experiment appeared to be around 15°. Results of a control experiment were that subjects easily discriminated orientations differing by as little as 6° using the same stimulus materials. A threshold hypothesis represents one way to think about the flexibility and limitations of mental rotation performance.
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