Children between 2 years, 6 months old and 3 years, 2 months old correctly discriminate the relative number of objects in two rows; between 3 years, 2 months and 4 years, 6 months they indicate a longer row with fewer objects to have "more"; after 4 years, 6 months they again discriminate correctly. The discriminative ability of the younger children shows that the logical capacity for cognitive operations exists earlier than previously acknowledged.
Iowa Science Teachers' Journal
© Copyright 1969 by the Iowa Academy of Science
Mehler, Jacques and Bever, Thomas G.
"Cognitive Capacity of Very Young Children,"
Iowa Science Teachers Journal: Vol. 6
, Article 12.
Available at: https://scholarworks.uni.edu/istj/vol6/iss4/12