Glossary I

Ipsilateral eye refers to the eye on the same side of the head as the structure to which the eye sends inputs.
IQ is the abbreviation for Intelligence Quotient which is an attempt to measure the intelligence of a person. The IQ score is usually based upon the results of a written test. To calculate the IQ, the person's mental age (as determined by a test) is divided by their chronologic age and the result is multiplied by 100.

IQ test, short for intelligence quotient test, is a standardized assessment designed to measure an individual's cognitive abilities and intellectual potential. These tests are widely used in psychology to evaluate a person's problem-solving skills, reasoning abilities, and general intelligence. IQ tests are an essential tool in the field of psychology for understanding human intelligence and cognitive functioning.

Iris the circular muscle that controls the amount of light entering the eye.

Iron law of oligarchy refers to Robert Michels’s principle of political and social control which predicts that in any group where power is concentrated in the hands of a few individuals (an oligarchy), these individuals will tend to act in ways that protect and enhance their power.
Irony refers to statements in which the intended meaning is opposite of the stated meaning
Irrational belief is defined as unreasonable views or convictions that produce emotional and behavioral problems.

Irrational Fear refers to apprehension before a threat which is non existent in reality.