An evaluation of P50 paired-click methodologies

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Cognitive Neuroscience

Background:

• The P50 paired-click measure, a neurophysiological tool, has potential limitations including unestablished reliability, temporal effects, and lengthy protocols.
• Optimizing the P50 measure is crucial for its broader application in clinical and research settings.

Purpose of the Study:

• To assess the within-session reliability of P50 paired-click measures.
• To investigate the impact of temporal factors, interpair interval (IPI) duration, and peak definition/calculation methods on P50 measures.
• To provide recommendations for improving the efficiency and reliability of P50 assessments in healthy individuals.

Main Methods:

• Evaluated within-session reliability of P50 measures using the difference and ratio methods.
• Examined the effect of time on P50 measures.
• Assessed the influence of varying interpair intervals (IPIs) (short vs. long).
• Compared P50 peak definition methods (baseline-to-peak vs. peak-to-peak) and ratio calculation.

Main Results:

• The difference method demonstrated higher reliability (ICC=.72) compared to the ratio method (ICC=.44).
• Defining P50 peaks as baseline-to-peak amplitude yielded more reliable results than peak-to-peak.
• Significant time-related changes in P50 measures were observed.
• P50 measures were comparable between short (3-7s) and long (9s) IPIs.

Conclusions:

• P50 paired-click measures exhibit good within-session reliability when using the difference method and baseline-to-peak amplitude definition, after accounting for time effects.
• Temporal effects necessitate careful consideration in P50 measurement protocols, particularly in extended paradigms.
• The interpair interval (IPI) can be reduced in studies involving healthy participants without compromising P50 measures.