Quantification of small numbers of dots: Subitizing or pattern recognition?  

Oleh:

Wolters, Genizus ; Van Kempen, Hanneke ; Wijlhuizen, Gert-Jan

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: The American Journal of Psychology vol. 100 no. 2 (1987), page 225.
Topik: Quantification; Subtizising; Numbers
Fulltext: 1422405.pdf (1.26MB)

Isi artikel

The fast and accurate quantification of small numbers of elements, called subitizing, has been explained by assuming either a limited capacity for immediate apprehension of numerosity, a fast number-dependent quantification process, or a pattern recognition process. A review of the available evidence suggests a pattern-recognition explanation for subitizing. To test this, patterns of 4-18 dots were presented in daily sessions on 5 consecutive days. There were two experimental conditions. In the constant-pattern condition, each number of dots was presented as the same random pattern throughout the experiment. In the variable-pattern condition, all patterns were generated randomly before each trial. By Day 5, both reaction times and accuracy scores in the constant-pattern condition indicated that subitizing occurred over the whole range of dot numbers used. Subitizing did not develop in the variable-pattern condition, although some practice effects were found. It is concluded that subitizing can best be explained as a patternrecognition process. Under normal circumstances this process is limited to small numbers of elements, because with larger numbers the number of possible configurations becomes too large to allow unequivocal pattern discrimination and pattern recognition.

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