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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Updated: Jan 23, 2026

Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
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Modified basic and specific (BASP) classification for pattern hair loss.

Beom Jun Kim1, Jaewoong Choi1, Sung Jay Choe1

  • 1Department of Dermatology and Institute of Hair and Cosmetic Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.

International Journal of Dermatology
|June 25, 2019
PubMed
Summary
This summary is machine-generated.

A modified Basic and Specific (BASP) classification for pattern hair loss improves upon the original system by addressing limitations in frontal, temporal, and occipital area assessments. This enhanced classification aims for more precise diagnosis of diverse hair loss patterns.

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Area of Science:

  • Dermatology and Trichology
  • Medical Classification Systems

Background:

  • The original Basic and Specific (BASP) classification for pattern hair loss, introduced in 2007, offered a race- and gender-neutral approach.
  • Limitations of the existing BASP classification include crude frontal type grading and inability to specify hair loss patterns involving temporal and occipital areas.

Purpose of the Study:

  • To introduce a modified Basic and Specific (BASP) classification system for pattern hair loss.
  • To address the limitations of the existing BASP classification, particularly concerning frontal, temporal, and occipital scalp involvement.

Main Methods:

  • The modified BASP classification refined frontal type grading into five grades (from three) and incorporated recording of temporal or occipital scalp involvement.
  • Accuracy and ease of use were evaluated by comparing the modified BASP classification with the existing system in 138 patients with pattern hair loss.

Main Results:

  • Temporal or occipital scalp involvement was identified in 11.1% of the study subjects.
  • The existing BASP classification demonstrated higher final type accuracy (82.5%) and ease of use (70.2-72.1%) compared to the modified method (71.4% accuracy, 48.9-52.2% ease of use).

Conclusions:

  • The modified BASP classification is anticipated to overcome the limitations of the existing system.
  • This revised classification is proposed as a valuable tool for diagnosing previously unclassified pattern hair loss types.