= Developmental psychologist
A <developmental psychologist> studies changes and continuities in <behavior> and <cognition> over development. A <longitudinal study> follows the same participants, whereas a <cross-sectional study> compares different groups at one period. These designs distinguish different questions: an age-group difference need not equal the change any particular individual will undergo. Experiments and observations can connect developmental outcomes to specific <learning> opportunities or mechanisms. <APA Dictionary of Psychology by the American Psychological Association>[developmental psychology entry]{ref}
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