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Related Concept Videos

Hearing01:31

Hearing

When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
Hair Cells01:22

Hair Cells

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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The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Life Histories

Constrained by limited energy and resources, organisms must compromise between offspring quantity and parental investment. This trade-off is represented by two primary reproductive strategies; K-strategists produce few offspring but provide substantial parental support, whereas r-strategists produce much progeny that receives little care. These strategies are related to an organism’s survival likelihood across its lifespan, which is represented by a survivorship curve. Three general types of...
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Humoral Immune Responses

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Olfaction

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Related Experiment Video

Updated: Jul 11, 2026

Blood Collection from the American Horseshoe Crab, Limulus Polyphemus
12:48

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Published on: October 13, 2008

John L. Horn (1928-2006).

John J McArdle1

  • 1University of Southern California, CA, USA.

The American Psychologist
|September 19, 2007
PubMed
Summary

John Horn

Area of Science:

  • Psychology
  • Cognitive Science
  • Multivariate Analysis

Background:

  • John Horn was a distinguished scholar known for his intellectual rigor and respected contributions to psychology.
  • His career spanned decades, marked by significant methodological advancements and critical engagement with research trends.

Discussion:

  • Horn's factor-analytic methods from the 1960s were foundational.
  • He actively participated in methodological debates throughout the 1970s and 1980s, challenging prevailing research norms.
  • His steadfast opposition to faddish trends in psychological research underscored his commitment to rigorous scientific inquiry.

Key Insights:

  • Horn's work compelled researchers to question assumptions and critically evaluate data.
  • He fostered a deeper, more analytical approach to psychological research.

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  • His influence extended to shaping how psychologists conduct research and interpret findings.

    • Outlook:

    • Horn's legacy is expected to continue inspiring advancements in multivariate analysis and human cognitive abilities.
    • His challenging methodologies and intellectual rigor will likely influence future generations of researchers.
    • His contributions remain relevant for ongoing studies in cognitive psychology and data analysis.