A team led by Michael Rutter found that disorders of this phenomenon were rare in Romanian-English orphans born during the Ceauşescu (“cho-SHESS-koo”) regime. Harry Harlow studied this phenomenon in rhesus macaques by constructing cloth-and-wire “surrogates,” (10[1])which inspired John Bowlby’s (10[2])theory of this phenomenon. In an experiment studying this phenomenon, a stranger talked to a parent before the parent left the stranger with their child. (-5[1])Mary (10[1])Ainsworth’s (10[2])“strange situation” experiment studied this phenomenon, whose three “styles” are “secure,” “anxious-ambivalent,” and “anxious-avoidant.” (10[2])For 10 points, name this feeling that an infant feels toward a caregiver. ■END■ (10[1])