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Taste laterality in the split brain.

S M Aglioti1, G Tassinari, M Fabri

  • 1Dipartimento di Psicologia, Università 'La Sapienza', Via dei Marsi 78, 00185 Roma, Italy.

The European Journal of Neuroscience
|January 3, 2001
PubMed
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Taste information bypasses the corpus callosum to reach the left hemisphere, with ipsilateral tongue input showing a functional advantage. The corpus callosum equalizes taste input from both sides of the tongue.

Area of Science:

  • Neuroscience
  • Gustatory Neuroscience
  • Neuroanatomy

Background:

  • The corpus callosum facilitates interhemispheric communication.
  • Understanding gustatory pathway lateralization is crucial for brain function.
  • Previous studies suggest callosal involvement in taste processing.

Purpose of the Study:

  • To investigate taste discrimination in patients with corpus callosum resection.
  • To determine the role of the corpus callosum in integrating ipsilateral and contralateral taste information.
  • To explore hemispheric dominance in gustatory processing.

Main Methods:

  • Assessed taste discrimination (sour, bitter, salty) in two corpus callosum resection patients and controls.
  • Utilized a language-based discrimination task with visual/verbal responses.

Related Experiment Videos

  • Applied stimuli to right and left sides of the tongue.

    • Main Results:

    • Patients with corpus callosum resection showed above-chance taste discrimination.
    • A significant advantage in accuracy and reaction time was observed for left-sided tongue stimuli.
    • Normal controls and a patient with posterior callosum sparing exhibited no such lateralization.

    Conclusions:

    • Taste information can reach the left hemisphere without the corpus callosum.
    • Ipsilateral tongue input to the left hemisphere is functionally dominant.
    • The corpus callosum, particularly the splenium, equalizes bilateral gustatory input to the left hemisphere.