Humans prefer to be addressed in their right ear and are more likely to perform a task when they receive the request in the right ear rather than the left, according to new research.
In a series of three studies, looking at ear preference in communication between humans, Luca Tommasi, PhD, and Daniele Marzoli from the University Gabriele d’Annunzio in Chieti, Italy, show that a natural side bias, depending on hemispheric asymmetry in the brain, manifests itself in everyday human behavior, according to a statement from Springer Science + Business Media, Berlin. The findings are published online in Springer’s journal Naturwissenschaften.
One of the best known asymmetries in humans is the right ear dominance for listening to verbal stimuli, which is believed to reflect the brain’s left hemisphere superiority for processing verbal information, according to the statement. However, until now, the majority of studies looking at ear preference in human communication have been controlled laboratory studies and there is very little published observational evidence of spontaneous ear dominance in everyday human behavior, the statement says.
Tommasi and Marzoli’s three studies specifically observed ear preference during social interactions in noisy night club environments. In the first study, 286 clubbers were observed while they were talking, with loud music in the background. In total, 72% of interactions occurred on the right side of the listener. These results are consistent with the right ear preference found in laboratory studies and questionnaires and they demonstrate that the side bias is spontaneously displayed outside the laboratory, the researchers note.
In the second study, the researchers approached 160 clubbers and mumbled an inaudible, meaningless utterance and waited for the subjects to turn their head and offer either their left of their right ear. They then asked them for a cigarette. Overall, 58% offered their right ear for listening and 42% their left. Only women showed a consistent right-ear preference. In this study, there was no link between the number of cigarettes obtained and the ear receiving the request.
In the third study, the researchers intentionally addressed 176 clubbers in either their right or their left ear when asking for a cigarette. They obtained significantly more cigarettes when they spoke to the clubbers’ right ear compared with their left.
According to the authors, taken together, these results confirm a right ear/left hemisphere advantage for verbal communication and distinctive specialization of the two halves of the brain for approach and avoidance behavior.
They conclude: “Our studies corroborate the idea of a common ancestry—in humans and other species—of lateralized behavior during social interactions, not only for species-specific vocal communication, but also for affective responses.”
Reference: Marzoli D & Tommasi L (2009). Side biases in humans (Homo sapiens); three ecological studies on hemispheric asymmetries. Naturwissenschaften. DOI 10.1007/s00114-009-0571-4.
[Source: Springer Science + Business Media]
