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The cortical processing of perceived emotion: a DC-potential study on affective speech prosody
H Pihan1, E Altenmüller, H Ackermann
1Department of Neurology, University of Tübingen, Germany.
Neuroreport
|February 10, 1997
Summary
The right hemisphere (RH) plays a key role in processing emotional significance in speech. Emotional intonation and pitch variations in sentences activate the RH, influencing emotional perception.
Area of Science:
- Neuroscience
- Psychology
- Linguistics
Background:
- The human brain's processing of emotional cues in auditory stimuli, particularly speech, is complex.
- Understanding hemispheric lateralization in emotional prosody perception is crucial for cognitive neuroscience.
Purpose of the Study:
- To investigate the role of the right hemisphere (RH) in processing emotional prosody in declarative sentences.
- To examine how acoustic variations (pitch and duration) in emotional and neutral speech affect electroencephalogram (EEG) signals.
Main Methods:
- Recorded direct current (DC) electroencephalogram (EEG) components in 16 right-handed subjects.
- Presented pairs of declarative sentences with happy, sad, or neutral intonation, varying pitch (fundamental frequency, FO) or syllable duration.
- Subjects identified emotional categories and perceived emotional expressiveness.
Main Results:
- Happy and sad intonation, along with FO-manipulated neutral sentences, elicited significant right-lateralized negativity.
- Discriminating time-manipulated neutral stimuli showed reduced RH amplitudes compared to FO-varied stimuli.
- These findings suggest RH dominance in evaluating the emotional significance of sensory input.
Conclusions:
- The right hemisphere is predominantly involved in processing the emotional significance of auditory sensory input, particularly in speech.
- Acoustic cues like pitch and duration differentially engage hemispheric processing for emotional content.