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cal competence indicates a n ability t o generalize abstract categories across domains: Numberi s not a n inherent at- tribute o f a n object, a s i s color, shape, o r material, but i s rathera  descriptor thati s applicablet o any discrete collection ofentities .Whethe r numerical competenceindicate s general abstract cognitiveprocessin g abilities remains,however ,t o be fully tested. Central t o this issuei s what constitutes numerical com- petence. Unfortunately, for quantities most often studied (1-8),tw o enumeration processes appeart o exist:Stabilizing, a supposedly fast, effortless, perceptual apprehension o f numbers usuallyu pt o4  thatuse spreattentiv e mechanisms (Kaufman, Lord,Reese , & Volkmann , 1949; Stevens, 1951; Taves, 1941; Wolters, van Kempen, &  Wijlhuizen, 1987), This research was supported b y National Science Foundation

Numerical competence in an African gray parrot (Psittacus erithacus).