Hemispheric dominance underlying the neural substrate for learned vocalizations develops with experience.

Abstract:

:Many aspects of song learning in songbirds resemble characteristics of speech acquisition in humans. Genetic, anatomical and behavioural parallels have most recently been extended with demonstrated similarities in hemispheric dominance between humans and songbirds: the avian higher order auditory cortex is left-lateralized for processing song memories in juvenile zebra finches that already have formed a memory of their fathers' song, just like Wernicke's area in the left hemisphere of the human brain is dominant for speech perception. However, it is unclear if hemispheric specialization is due to pre-existing functional asymmetry or the result of learning itself. Here we show that in juvenile male and female zebra finches that had never heard an adult song before, neuronal activation after initial exposure to a conspecific song is bilateral. Thus, like in humans, hemispheric dominance develops with vocal proficiency. A left-lateralized functional system that develops through auditory-vocal learning may be an evolutionary adaptation that could increase the efficiency of transferring information within one hemisphere, benefiting the production and perception of learned communication signals.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Chirathivat N,Raja SC,Gobes SM

doi

10.1038/srep11359

subject

Has Abstract

pub_date

2015-06-22 00:00:00

pages

11359

issn

2045-2322

pii

srep11359

journal_volume

5

pub_type

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