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Gustatory neural coding in the monkey cortex: L-amino acids.

C R Plata-Salaman1, T R Scott, V L Smith-Swintosky

  • 1Department of Psychology, University of Delaware, Newark 19716.

Journal of Neurophysiology
|June 1, 1992
PubMed
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Researchers studied taste responses in monkey brains, finding that sweet and salty stimuli strongly activate gustatory neurons. This research supports using monkey models to understand human taste perception.

Area of Science:

  • Neuroscience
  • Sensory Biology
  • Gustation Research

Background:

  • The primary gustatory cortex processes taste information.
  • Understanding neural responses to various taste stimuli is crucial for deciphering sensory perception.
  • Previous studies have established basic taste categories and their human psychophysical correlates.

Purpose of the Study:

  • To analyze single-neuron activity in the primary gustatory cortex of cynomolgus monkeys in response to diverse taste stimuli.
  • To compare neural responses in monkeys with human psychophysical data for key taste compounds, including amino acids.
  • To investigate the organization and response properties of gustatory neurons in the primate cortex.

Main Methods:

  • Recorded single-neuron activity in the primary gustatory cortex of alert cynomolgus monkeys.

Related Experiment Videos

  • Presented a range of taste stimuli: prototypical (glucose, NaCl, HCl, quinine), fruit juice, and 12 L-amino acids.
  • Analyzed neuronal responses, including firing rates and tuning properties, and compared them to human taste perception data.

    • Main Results:

    • Gustatory neurons were identified within a specific cortical region; most neurons responded best to sweet (glucose) or salty (NaCl) stimuli.
    • Stimuli perceived as bitter or insipid by humans elicited weaker neuronal responses.
    • Neural activity patterns for several amino acids corresponded to their dominant human taste qualities (sweet, salty, sour, bitter).
    • A moderate breadth of sensitivity was observed, with no clear chemotopic organization in the taste cortex.

    Conclusions:

    • Monkey gustatory cortex responses align well with human taste perception, particularly for L-amino acids.
    • This neural model is valuable for studying human taste perception mechanisms.
    • The findings highlight the cortex's role in discriminating taste qualities, with a strong representation for sweet and salty tastes.