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This study reconsidered the validity of the maternal sensitivity construct by multilevel assessments of mothers' behaviors during mother-infant play interactions with toys in 40 mother-infant pairs at 6 months of age. To score maternal sensitivity, Ainsworth's maternal sensitivity scale, and three types of behavioral rating were introduced.; 1)the maternal sensitivity scales to infant positive affect, negative affect and intention; 2)micro-analysis of behaviors in mothers, infants and mother-infant interactions; 3)content analysis of maternal speech. The results showed that Ainsworth's maternal sensitivity was highly correlated to sensitivity to infant's intention and frequency of maternal specific speech in which mothers spoke for infants with reading infants' mind but it was not related to any individual behaviors both in mothers and infants. These results indicated that maternal ability to take infant's point of view is the most important to enhance infant attachment security.