Normative data for the lateralization task in the assessment of intranasal trigeminal function

Area of Science:

• Neuroscience
• Sensory Science

Background:

• Intranasal trigeminal function is crucial for sensory perception.
• Normative data for assessing this function are limited.

Purpose of the Study:

• To establish normative data for the lateralization task assessing intranasal trigeminal function.
• To explore the influence of age, sex, and olfactory function on this task.

Main Methods:

• The lateralization task with eucalyptus was administered to 360, 284, and 418 healthy adults for 40, 20, and 10-trial versions, respectively.
• Olfactory function was assessed using the "Sniffin Sticks" test.

Main Results:

• Mean scores were 35.46 ± 4.50 (40-trial), 15.64 ± 3.65 (20-trial), and 8.14 ± 2.16 (10-trial).
• The 10th percentiles for the 18-25 age group were 33 (40-trial), 11 (20-trial), and 6 (10-trial).
• Age and odor discrimination significantly impacted lateralization performance.

Conclusions:

• Reference scores for the lateralization task are provided.
• The 40-trial version offers the most reliable assessment of intranasal trigeminal function.
• Scores ≥33 suggest normal function; scores <27 may indicate decreased trigeminal function.