Table 1 PCA on Human behaviour.

From: Similarities and differences in the functional architecture of mother- infant communication in rhesus macaque and British mother-infant dyads

Infant behaviours

 Proto-communicative mouth gestures

0.809

 Positive vocalisations

0.775

 Smiles

0.716

 Non-social mouth movements

− 0.481

 Negative affect

− 0.387

Maternal responses

 Marking

0.831

 Mirroring

0.797

 Negative responses

0.320

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