Left hemisphere EEG coherence in infancy predicts infant declarative pointing and preschool epistemic language

Abstract

Pointing plays a central role in preverbal communication. While imperative pointing aims at influencing another person’s behavior, declarative gestures serve to convey epistemic information and to share interest in an object. Further, the latter are hypothesized to be a precursor ability of epistemic language. So far, little is known about their underlying brain maturation processes. Therefore, the present study investigated the relation between brain maturation processes and the production of imperative and declarative motives as well as epistemic language in N = 32 infants. EEG coherence scores were measured at 14 months, imperative and declarative point production at 15 months and epistemic language at 48 months. Results of correlational analyses suggest distinct behavioral and neural patterns for imperative and declarative pointing, with declarative pointing being associated with the maturation of the left hemisphere. Further, EEG coherence measures of the left hemisphere at 14 months and declarative pointing at 15 months are related to individual differences in epistemic language skills at 48 months, independently of child IQ. In regression analyses, coherence measures of the left hemisphere prove to be the most important predictor of epistemic language skills. Thus, neural processes of the left hemisphere seem particularly relevant to social communication.

Keywords:

• Declarative and imperative point production
• Epistemic language
• EEG
• Infancy

Special thanks go to Sabrina Krimmel, Hannah Perst, the Babylab and the EEG-lab team for support in data acquisition and coding as well as all families who participated in this study.

Additional information

Funding

The work was supported by a DFG grant So 213/27-1 to Beate Sodian.