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[Objective gustometry with adequate stimulation by registration of contingent negative variation]
EEG-EMG Zeitschrift Fur Elektroenzephalographie, Elektromyographie Und Verwandte Gebiete
|September 1, 1984
Summary
Researchers developed an objective method using the contingent negative variation (CNV) to assess taste perception. This electrophysiological technique shows promise for diagnosing taste loss and differentiating gustatory qualities.
Area of Science:
- Neuroscience
- Psychophysics
Context:
- Cortical evoked potentials typically require precise sensory stimulation.
- Gustatory stimuli present challenges for reproducible onset.
- Contingent Negative Variation (CNV) has proven effective in objective olfactometry and speech audiometry.
Purpose:
- To investigate the feasibility of recording the contingent negative variation (CNV) for gustatory stimuli.
- To establish an objective method for assessing taste perception and diagnosing taste disorders.
Summary:
- A novel method was developed to record the CNV in response to gustatory stimuli (sour, sweet, bitter, salty) delivered via a specialized oral device.
- A reproducible negative vertex potential was observed between taste recognition and an expected acoustic signal.
- Clinical application demonstrated the CNV's ability to detect unilateral taste loss in a patient with chorda tympani interruption, with responses only on the unaffected tongue side.
Impact:
- Provides an objective electrophysiological method for diagnosing taste dysfunction, including unilateral loss and differentiation of gustatory qualities.
- Offers a valuable tool for clinical audiology and neurology, complementing subjective taste assessments.
- Highlights the potential of CNV in objective sensory testing beyond olfaction and speech.