Schaffer and Emerson's famous study of infant attachment applied a ____ research design.

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Schaffer and Emerson's study used a longitudinal design, which involved following a group of infants over a period of time and observing their patterns of attachment to their primary caregiver. This allowed the researchers to observe changes in attachment behavior as the infants aged, which would not have been possible in a cross-sectional comparison or sequential design. While case studies may also provide in-depth insight into a particular individual or situation, Schaffer and Emerson's study was focused on patterns of attachment in a larger group of infants over time.

Schaffer and Emerson's Famous Study of Infant Attachment Applied a ____