628 APPENDICES is also true. The parent is naturally inclined to follow the movement of the baby: what is the baby looking at? This mutual communication between parent and baby is based entirely on mutual movements, where vocal sounds can also be seen as a movement of the vocal cords. It is the parent who takes advantage of the baby’s ability to be attuned to the parent’s movements. The parent follows the baby’s movement, then makes a distinguishing movement, and the baby follows the parent. This innate trait of ‘beingmoved with’ the movements of others or the environment is the mechanism that is at the core of our method. This mechanism is not exclusive to parents and babies or goslings and their parents, but plays a role in all kinds of relationships, regardless of age, culture, or background, and is rooted in movement. Togetherness and Autonomy From disciplines other than attachment theory or the development of the Self, there have been indications that movement invites and particularly influences the effect of movement. This phenomenon is called synchrony or a synchronisation process, described by Christiaan Huygens in 1665. He discovered that two pendulum clocks, hanging on a common wooden beam, would eventually swing back and forth in perfect synchrony regardless of their starting positions. The secret of this phenomenon lay in the barely noticeable vibrations of the wooden beam, caused by the movements of the clock pendulums. Two systems with different frequencies can influence each other and come to a synchronised rhythm if they are connected (Pikovsky et al., 2001). It is a form of tuning based on mutual rhythms and frequencies. This process of becoming more similar in rhythm is called synchronisation. This process is not only limited to mechanical systems. Today, it is known that biological systems, from the simplest to the most advanced, also synchronise. In fact, all systems, whether biological, mechanical, electronic, or chemical, have their own rhythm and can adjust their rhythm to another system. The application of this discovery has found its way into the manufacturing and refinement of clocks and later into radio communication and electrical engineering, such as generators. Nowadays, a society without these applications has become unthinkable. In social sciences, attention gradually shifted towards the phenomena of synchrony and synchronisation. Numerous studies revealed a consistent message: ‘people tend to synchronise their movements with each other’. This synchronisation can be observed at the level of shared rhythm, form, or intensity of movement. This finding was referred to as the ‘chameleon effect’, suggesting a tendency to become ‘similar’ to others. The purpose of this inclination was labelled ‘social glue’ by Lakin and her colleagues (2003), highlighting its role in communication. In a meta-analysis of 42 studies, Mogan et al. (2017) reported that synchrony has a positive impact on prosocial behaviour, social cohesion within groups (such as trust, likability, and sense of unity), social cognition (including attention, memory, theory of mind, creativity, and adaptability), and affectivity (including happiness, self-esteem, and satisfaction).
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