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Chapter 7218individuals with the same condition (e.g., autism). In support of this assumption, some studies have shown that individuals on the autism spectrum tend to have more positive experiences in interactions with other individuals on the autism spectrum compared to interactions with non-autistic individuals (Crompton et al., 2020; Morrison et al., 2020). Moreover, they tend to be more accurate in judging facial expressions posed by individuals on the autism spectrum (Lampi et al., 2023). Yet, other researchers highlight alterations specific to autism in biological and behavioural rhythmicity, including in establishing synchrony with others (Baldwin et al., 2022; Bowsher-Murray et al., 2022; Tordjman et al., 2015). Eventually, altered interpersonal synchrony may arise from a combination of characteristics of the individual and the dyad in autism (McNaughton & Redcay, 2020). Research on the role of misattunement in social interaction difficulties in social anxiety is scarce. If social anxiety traits are low in an interaction partner, individuals with high social anxiety traits expect to be perceived more negatively (Kashdan & Savostyanova, 2011), experience less closeness in interactions (Kashdan & Wenzel, 2005) and in the formation of friendships (Boucher et al., 2015). In how far a mismatch in social anxiety traits (or in diagnoses) affects the processing of others%u2019 expressions and immediate feelings of connectedness is, to date, still unknown. In my preliminary analysis of the interactive trust game data, I also included differences in autistic traits and social anxiety traits between the partners in a dyad in predicting subjective experiences, physiological synchrony, and their link to trust behaviour. When the difference in social anxiety traits was higher in a dyad, partners were evaluated as less trustworthy and as less close to the self. Additionally, when the partner was visible, the feeling of closeness was more strongly linked to monetary investments in dyads with a smaller difference in social anxiety scores. Thus, interactions between more attuned individuals in terms of social anxiety traits may indeed result in more positive experiences, impacting interaction outcomes. I did not observe any effects related to autistic trait level differences, which might be owing to the limited range of autistic traits in the nonclinical sample. Supporting the spotlight on qualitatively different processes and experiences in neurodivergent populations, misattunement might only become relevant in interactions between different neurotypes, such as a neurotypical individual and an individual on the autism spectrum (Sasson & Bottema-Beutel, 2022).