Auditory middle latency evoked responses: a standardizing study

Area of Science:

• Neuroscience
• Audiology
• Evoked Potentials

Background:

• Auditory middle latency evoked responses (AMLRs) are crucial for evaluating the integrity of the peripheral and central auditory system.
• These responses provide insights into auditory pathways up to the thalamocortical region and primary auditory cortex.

Purpose of the Study:

• To evaluate the presence, latencies, and intervals of numerous peaks in AMLRs.
• To establish a standardizing study for these responses in a specific population.

Main Methods:

• A quantitative, descriptive, non-experimental cohort study with a transversal cut was conducted.
• Middle latency auditory potentials were studied in young adults (18-30 years) with normal hearing.
• Monauricular resonant stimulation and capitation were used with surface electrodes on both cerebral hemispheres.

Main Results:

• Statistically non-significant results were found across analyzed crossings, allowing for the stipulation of a pattern.
• Average and standard deviation values were determined for Po, Na, Pa, Nb, Pb waves, and the Na-Pa interval.
• Po waves: avg 12.09, SD 1.84; Na: 17.91, 2.60; Pa: 29.41, 5.66; Nb: 41.43, 8.89; Pb: 51.44, 12.63; Na-Pa interval: 11.52, 4.99.

Conclusions:

• Defluxions Po, Na, and Pa were present in all recordings; Nb and Pb were absent in only 6% of recordings.
• AMLRs, reflecting electrical activity in the thalamocortical area evoked by sound, serve as a reliable method for detecting average auditory potential latency.
• A normative response pattern for young adults with normal hearing was established, aiding future studies on hearing system alterations.