The concepts of attachment and attachment behavior are considered from an ethological-evolutionary viewpoint. Attachment heliavior and exploration are viewed in balance, and the biological functions of each are discussed. As an illustration of these concepts, a study is reported of 56 white, middle-class infants, 49-~51 weeks of age, in a strange situation. The presence of the mother was found to encourage exploratory behavior, her absence to depress exploration and to heigJiten attachment behaviors. In separation episodes such behaviors as crying and search increased. In reunion episodes proximity-seeking and contact-maintaining behaviors were heightened. In a substantial proportion of Ss, contact-resisting behaviors were also heightened in the reunion episodes, usually in conjunction with contactmaintaining behaviors, thus suggesting ambivalence. Some Ss also displayed proximity-avoiding behavior in relation to the mother in the reunion episodes. These findings are discussed in the context of relevant observational, clinical, and experimental studies of human and nonhuman primates, including studies of mother-child separation. In conclusion, it is urged that the concepts of attachment and attachment behavior be kept broad enough to comprehend the spectrum of the findings of this range of studies. Within the last decade the term "attachment" has appeared with increasing frequency in both empirical and theoretical segments of the developmental psychological literature (
The criticisms leveled by Gewirtz and Boyd focus on 1 of 6 analyses upon which Bell and Ainsworth based their interpretation of findings--namely, cross-quarter correlations of measures of infant crying and maternal response. It is maintained that these measures were approximate, and that they were independent of each other in cross-quarter correlations. It is also maintained that the statistical procedures were appropriate to a small sample of subjects in naturalistic, longitudinal research. The three "illustrative" cases offered by Gewirtz and Boyd as ways of testing a contrary hypothesis are considered. These cases assumed maternal behavior patterns which, it is argued, do not occur. Finally, other evidence is cited, both from other studies and from within the Bell-Ainsworth paper itself, that supports the interpretation that Gewirtz and Boyd claim to have been unjustified.
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