Same-different judgments under high speed stress: Missing-feature principle predominates in early processing

Three well-practiced subjects madesame-different judgments of letter pairs under varying degrees of speed stress. In contrast to the preponderance of false-different errors found using the same method without speed stress (Chignell & Krueger), there were more false-same responses, particularly on similardifferent pairs. The early, or developing, percept looks very similar from one letter to another, apparently because real differences between letters frequently are missed, whereas spurious differences due to missing or unresolved features at encoding or comparison are simply disregarded (missing-feature principle) rather than interpreted as featural mismatches (internal-noise principle). Distinguishing features are added quite late (300 + msec) in processing, just as Eriksen, O’Hara, and Eriksen proposed.

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