Search Results for: visual
Visual acuity
visual acuity (Science: microscopy) The ability to detect fine details or small distances with the eye. Visual acuity can... Read More
Quadrantanopia
Definition noun, plural: quadrantanopias A visual field defect characterized by a loss of vision in a quarter section of the... Read More
Equilibrioception
Definition noun, plural: The sense of balance in humans and animals that involves visual system, vestibular system, and... Read More
Thalassophobia
Among many psychological and psychiatric disorders, one is the fear of the ocean and the fear of deep water, which in... Read More
Neurology of Illusions
As mentioned in the previous tutorial, Human Perception, illusions can be caused by mental disorders or misreading of the... Read More
![Hallucinations – a brain glitch – apparently could occur in animals, too. At least, according to a recent experiment on lab mice using optogenetics technique. [Img credit: Rick Harris (Flickr), by CC BY-SA 2.0]](https://www.biologyonline.com/wp-content/uploads/2019/07/hallucination-300x168.jpg)
Hallucination – Are we the only ones “seeing” things or animals hallucinate, too?
Hallucination is defined as perceiving something that seems real but in fact, it is not. Some references take it as a... Read More
Human Perception – Neurology
A better understanding of human perception unlocks the key to how the mind works, an advantage when working with people with... Read More
Types and Causes of Brain Damage
The brain is a highly specialized tissue, far more complex than today's 21st-century supercomputers. Due to this magnificent... Read More
Blindness – Evolutionary regression? Maybe not!
The recent Netflix's hit flick, Bird Box, surely startled the viewers with the thrilling scenarios revolving around the... Read More
Cyclic guanosine monophosphate
Definition noun plural: cyclic guanosine monophosphates (biochemistry) A cyclic form of guanosine monophosphate (chemical... Read More
Genotypic ratio
Genotypic Ratio Definition To understand 'Genotypic ratio', let us first understand the terms: 'Genotype' and 'Phenotype'.... Read More
Introductory Chemistry – a Foundation
Introductory Chemistry - a Foundation ... Read More
Leukocytosis
What Is Leukocytosis? Leukocytosis is a condition wherein the number of White Blood Cells (WBCs) is increased above the... Read More
Actions of Caffeine in the Brain with Special Reference to Factors That Contribute to Its Widespread Use
IV. Actions of Caffeine on Brain Functions and Behavior Having discussed the molecular and neuronal actions of caffeine,... Read More
Equilibrium
Equilibrium Definition In Biology Equilibrium refers to the state of balance and stability. In biology, equilibrium is... Read More
Binocular vision
Definition noun (1) (zoology) A type of vision wherein both eyes of an animal are used at the same time (as opposed to... Read More
Hypomelanism
All the body cells of living organisms bear some color due to one or the other pigment molecule or complex. The pigment can... Read More
Sense organ
Definition noun, plural: sense organs An organ or structure that has nerve endings capable of detecting and reacting to a... Read More
Tight junction
What are tight junctions? Tight junctions are the intercellular barrier between two neighboring endothelial and epithelial... Read More
Nocturnality
Definition noun, plural: nocturnalities (1) The condition of being active or occurring during the night (2) The active... Read More
Siphonophore
Definition noun, plural: siphonophores Any of the various marine invertebrate of the order Siphonohorae of the class... Read More
Austin disease
Definition noun A type of lysosomal storage disease that is often caused by a deficiency in multiple sulfatase enzymes, or... Read More
Vitreous humor
Definition noun The clear, gel-like body fluid in the vitreous chamber, i.e. the posterior cavity between the lens and the... Read More
Phenotypic ratio
Phenotypic Ratio Definition How would one define phenotypic ratio? The correlation between the amount of offspring that... Read More
Aqueous humor
Definition noun, plural: aqueous humors A clear, watery body fluid secreted by the ciliary epithelium, and fills the... Read More
Degenerative disease
Degenerative Disease Definition A degenerative disease is defined as a disease characterized by the worsening condition due... Read More
Sensory Systems
A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal and... Read More
Humans are Omnivores – Evidence
A number of popular myths about vegetarianism sprung with no scientific basis. One example of such a myth is that man is... Read More
Pleiotropy
Pleiotropy Definition When one single gene starts affecting multiple traits of living organisms, this phenomenon is known... Read More