This study explores the emergence of triadic interactions through the example of book sharing. As part of a naturalistic study, 10 infants were visited in their homes from 3–12 months. We report that (1) book sharing as a form of infant-caregiver-object interaction occurred from as early as 3 months. Using qualitative video analysis at a micro-level adapting methodologies from conversation and interaction analysis, we demonstrate that caregivers and infants practiced book sharing in a highly co-ordinated way, with caregivers carving out interaction units and shaping actions into action arcs and infants actively participating and co-ordinating their attention between mother and object from the beginning. We also (2) sketch a developmental trajectory of book sharing over the first year and show that the quality and dynamics of book sharing interactions underwent considerable change as the ecological situation was transformed in parallel with the infants' development of attention and motor skills. Social book sharing interactions reached an early peak at 6 months with the infants becoming more active in the coordination of attention between caregiver and book. From 7 to 9 months, the infants shifted their interest largely to solitary object exploration, in parallel with newly emerging postural and object manipulation skills, disrupting the social coordination and the cultural frame of book sharing. In the period from 9 to 12 months, social book interactions resurfaced, as infants began to effectively integrate manual object actions within the socially shared activity. In conclusion, to fully understand the development and qualities of triadic cultural activities such as book sharing, we need to look especially at the hitherto overlooked early period from 4 to 6 months, and investigate how shared spaces of meaning and action are structured together in and through interaction, creating the substrate for continuing cooperation and cultural learning.

In a series of exploratory experiments we investigated interrelations between structure and shape of architectural indoor spaces on the one hand, and affective experience and navigation behaviour on the other hand. For this, isovist-based descriptions of 16 virtual indoor scenes were correlated with behavioural data from the experimental tasks. For all tasks-two active navigation tasks and an introspective appraisal of experiential qualities--strong correlations between subjects' behaviour and a small set of quantitative measurands derived from the isovists were found. The outcomes suggest that isovist analysis captures behaviourally relevant properties of space and is therefore a promising general means for predicting central experiential qualities of architecture and navigation behaviour.

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In this paper, we show that early interaction can be seen as comprising of strands of coordinated activity on multiple levels and timescales. In tracing the development of such multilayered organization from an embodied and situated perspective, we underscore the role of the reliable presence of the structured environment, an enacted niche, supporting the segregation and integration of participatory interaction strands. This perspective allows us to study the development of social coordination not only in terms of development of individual skills but, crucially, as a change of participatory emergent patterns, a transformation in engagement. We illustrate this approach with some results from the collaborative research project on Early Semantic Development (EASE). Using qualitative microanalysis combined with quantitative dynamical time series analyses, we were able to demonstrate several layers of such organization: from local forms of coordination, such as basic informational coupling within a modality, and the emergence of specific social affordances, to more global co-action structures such as affect imbued ‘action arcs’ – dynamic action contours with a beginning, build-up, climax and resolution, co-enacted by participants. Pointing to future work, we underscore the potential of these global structures to contribute to the emergence of more complex interactions, such as composite activities within ‘pragmatic frames’, narratives, or language.

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