PSYC 101 Chapter Notes - Chapter 7: Number Sense, Intraparietal Sulcus, Habituation
Document Summary
Core system 1: approximate representaions of numerical magnitude: infants numerical knowledge tested using habituaion: infants look longer at 16 dots when habituated to 8. Dots must have a large raio (not 8 vs 12) Precision improves with development (raio decreases with age) 1:2 at 6 months, 2:3 at 9 months. Infants fail at discriminaing between small numbers (1 vs 2, 2 vs 4, 2 vs 3) even when raio is large. In both, larger numbers are represented by distribuions that overlap increasingly with nearby numbers, which increases likelihood of confusing a target with its neighbors (responsible for infants" raio-dependent performance: also present in older children and adults. Also raio-dependent and robust across muliple modaliies of input. Found that they always chose one that had the most when small numbers were involved, but once one bucket had more than three crackers (total number or raio between them did not mater), infants chose randomly.
