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Reflex Activity

Reflex Activity

A reflex activity is an automatic, involuntary response to specific stimuli. It is a part of our survival mechanism, designed to protect us from potential harm. For example, when a bright light suddenly shines into our eyes, we instinctively close them or look away. This is a simple reflex activity orchestrated by the nervous system without conscious thought or effort.
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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

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Related Experiment Video

Updated: May 29, 2026

Non-invasive Assessment of Changes in Corticomotoneuronal Transmission in Humans

Non-invasive Assessment of Changes in Corticomotoneuronal Transmission in Humans

Published on: May 24, 2017

The Fontana paradoxical reflex?

Federico Lavorini¹, Giovanni Fontana¹, Elisa Chellini¹

¹Department of Internal Medicine, University of Florence, Italy.

|September 8, 2011

Summary

This summary is machine-generated.

A new "deflation cough" reflex, triggered by deep lung deflations and potentially linked to acid reflux, has been described. This paradoxical reflex offers insights into lung function and potential clinical applications.

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Last Updated: May 29, 2026

Non-invasive Assessment of Changes in Corticomotoneuronal Transmission in Humans

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Published on: May 24, 2017

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Terminal H-reflex Measurements in Mice

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Published on: June 16, 2022

Area of Science:

Pulmonology
Gastroenterology
Neuroscience

Background:

Deep lung deflations can trigger a cough reflex.
Paradoxical reflexes, like Henry Head's described reflex for lung inflation, involve unusual physiological responses.
Gastroesophageal reflux is a common condition that can affect respiratory reflexes.

Purpose of the Study:

To describe the novel "deflation cough" reflex.
To explore the potential mechanisms and mediators of deflation cough.
To discuss the clinical significance of this reflex.

Main Methods:

This is a commentary, not an experimental study.
It reviews existing literature on lung reflexes and gastroesophageal reflux.
It proposes a mechanism for the deflation cough reflex.

Main Results:

A paradoxical cough reflex, termed "deflation cough," is proposed.
This reflex is likely mediated by lung sensors and afferent fibers, similar to those involved in inflation reflexes.
Gastroesophageal reflux may activate this reflex.

Conclusions:

The deflation cough reflex is likely self-limiting.
Paradoxical reflexes play a broader role in bodily functions.
Deflation cough may have clinical implications for diagnosing and managing certain respiratory and gastrointestinal conditions.