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Vision

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

Visual System

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...

Dreaming

Dreaming

Sigmund Freud revolutionized our understanding of dreams by proposing that they are a window into the unconscious mind. According to Freud, dreams are not mere stories our minds create while we sleep but are profoundly meaningful narratives about our hidden desires and fears. He introduced two key concepts: manifest content and latent content. The manifest content is the actual content and imagery of the dream — what we remember when we wake up. The latent content, however, represents the...

Lucid Dreaming

Lucid Dreaming

Lucid dreaming is a unique state of consciousness where an individual realizes they are dreaming while still in the dream. This awareness allows them to manipulate their dream environment consciously. Researchers like Stephen LaBerge have significantly contributed to the understanding of lucid dreams, highlighting that during these dreams, certain areas of the brain, such as the prefrontal cortex, that involve self-awareness and thought evaluation show increased activity.
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Color Vision

Color Vision

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.

Depth Perception and Spatial Vision

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

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A vision becoming reality.

¹Independent Consultant, Hitchin, Hertfordshire, UK.

Alternatives to Laboratory Animals : ATLA

|February 12, 2014

Summary

This summary is machine-generated.

Non-animal science, utilizing advanced human biology-based models, is revolutionizing toxicology and health research. This shift promises significant benefits for both human and animal welfare.

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Area of Science:

Toxicology and health research
Advancement of non-animal scientific methods

Background:

Non-animal science has progressed for decades but is now recognized as advanced.
Factors driving this change include novel human biology-based tools, regulatory shifts, and critiques of animal models.
The drug development pipeline faces persistent challenges.

Purpose of the Study:

To highlight the pivotal moment of change in toxicology and health research.
To underscore the increasing acceptance and integration of non-animal scientific approaches.
To discuss the potential benefits of these advancements for human and animal health.

Main Methods:

Review of the emergence of novel human biology-based tools and models.
Analysis of legislative and regulatory changes impacting toxicology.
Examination of critiques concerning the efficacy and ethics of animal models in research.

Main Results:

Non-animal science is transitioning from the leading edge to the norm in research.
Novel human biology-based approaches are gaining widespread acceptance.
A confluence of factors has created a pivotal moment for scientific advancement.

Conclusions:

The field of toxicology is embracing advanced, non-animal methodologies.
These scientific advancements are poised to yield positive outcomes for human and animal well-being.
The integration of new tools and models signifies a paradigm shift in health research.