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Lewis and Brooks-Gunn argued that an important developmental milestone is reached when children become
able to recognize themselves visually without the support of seeing contingent movement. This recognition
occurs around their second birthday. In one experiment, Lewis and Brooks-Gunn (1979) dabbed some red
powder on the noses of children who were playing in front of a mirror, and then observed how often they
touched their noses. The psychologists reasoned that if the children knew what they usually looked like, they
would be surprised by the unusual red mark and would start touching it. On the other hand, they found
that children of 15 to 18 months are generally not able to recognize themselves unless other cues such as
movement are present.
H
Finally, perhaps the most graphic expressions of self-awareness in general can be seen in the displays of rage
which are most common from 18 months to 3 years of age. In a longitudinal study of groups of three or four
children, Bronson (1975) found that the intensity of the frustration and anger in their disagreements increased
sharply between the ages of 1 and 2 years. Often, the children's disagreements involved a struggle over a toy
that none of them had played with before or after the tug-of-war: the children seemed to be disputing
ownership rather than wanting to play with it. Although it may be less marked in other societies, the link
between the sense of 'self' and of 'ownership' is a notable feature of childhood in Western societies