We also found that the three dyads that showed longer language pa

We also found that the three dyads that showed longer language patterns were also those more capable of symmetry. The role of language in the development of joint engagement has also

been underlined by Brinck and Gärdenfors (2003). According to them, earlier forms of joint attention are based on information present in the actual context, but later forms imply communication about absent goals and therefore require agents to use symbolic means of sharing. In their words, “a major reason for evolution of language is that it enhances co-operation” (p. 492). Our study, by showing that symmetrical exchanges are longer in more dialogical dyads, adds to this claim. Finally, the variance in the observational sessions differed between coregulation patterns, increasing significantly in symmetrical and language patterns Apoptosis Compound Library cell line SB431542 purchase and remaining stable in unilateral. In other words, the unilateral form of coregulation decreased over time without fluctuating from one session to the

next, whereas symmetrical and language forms increased with an increasing local fluctuation. With reference to the dynamic system perspective, which claims a greater instability of a phenomenon when emerging (Thelen & Smith, 1994), we could trace this difference to the timing of the developmental appearance of the two forms. As symmetrical patterns are emergent in the second year of life, the dyads advance toward the symmetry with a certain degree of uncertainty, so the duration of these patterns Verteporfin clinical trial increases in an irregular manner. On the other hand, the unilateral form is more familiar in that period and on the wane; so, it decreases in a much more controlled manner. To conclude, we identified a normative trend in interpersonal coregulation between mother and

infant when they interact in social play during the second year of infant life. As we found, coregulation changes from unilateral to symmetrical mode and this change occurs around the middle of the year. We also verified that this trend is not completely predictable but is accompanied by a great deal of individual variability which affects the rate of the transition. As regards the factors which possibly account for this effect, preliminary analyses showed that they differ in relation to different processes. The increase in language exchanges, for example, varied between the dyads owing to some constitutive aspects, such as infant gender moderated by infant age; conversely, differences in symmetrical trends are influenced by earlier modes of interaction, so depending on more particular aspects, such as each dyad’s unique history. Finally, we found that the above trend occurred with some degree of uncertainty, as shown by the significant increase in variability across sessions with respect to symmetrical and language frames.

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