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Where Sounds Occur Matters: Context Effects Influence Processing of Salient Vocalisations
Atiqah Azhari1, Paola Rigo1,2, Marc H Bornstein3,4
1Psychology Program, School of Social Sciences, Nanyang Technological University, Singapore 639798, Singapore.
Brain Sciences
|July 10, 2020
Summary
Environmental context significantly influences how the brain processes vocalizations. Outdoor settings, compared to domestic ones, demand greater prefrontal cortex (PFC) activation for processing salient vocal cues, indicating increased cognitive effort.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Social Cognition
Background:
- Social context shapes affective interpretation of human vocalizations.
- Visual context's role in vocalization processing is understudied.
- Prefrontal cortex (PFC) involvement in contextual processing and vocalization salience is known.
Purpose of the Study:
- Investigate how environmental context (domestic vs. outdoors) modulates PFC activity during vocalization processing.
- Hypothesize greater PFC activation for outdoor contexts due to their variability and unpredictability.
- Explore differential processing of emotive infant and adult vocalizations.
Main Methods:
- Functional Near-Infrared Spectroscopy (fNIRS) used on young adults (N=18).
- Participants passively viewed domestic (DE) and outdoor (OE) environments.
- PFC responses to emotive infant and adult vocalizations were measured.
Main Results:
- Greater activation in the left rostrolateral PFC observed in the outdoor (OE) compared to the domestic (DE) condition.
- This finding supports the hypothesis that OE contexts require greater cognitive resources.
- Left rostrolateral PFC activation suggests enhanced relational integration for outdoor situational information and vocalizations.
Conclusions:
- Environmental context differentially modulates the processing of salient vocalizations.
- Outdoor environments necessitate greater cognitive effort for processing vocal cues within their context.
- Results deepen understanding of context-dependent auditory processing in the PFC.
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