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Myelin Myelin is a fatty substance that covers neurons. Around your neurons is a myelin sheath (a layer of myelin) that helps …

Narcissistic Personality (Narcissism) A person with a narcissistic personality is totally centered on his or her own needs and feelings while ignoring …

Multistage Sampling Multistage Sampling is a sampling strategy (e.g., gathering participants for a study) used when conducting studies involving a very large …

Multiple Personality Disorder A personality disorder where an individual seems to possess more than one personality. People who suffer from this disorder …

Mueller-Lyer Illusion The Mueller-Lyer Illusion is an optical illusion involving two lines and arrowheads at the ends of each line. When two …

Motor Neurons As you know, information is traveling throughout your brain and body all the time. As I type this definition, information …

Motor Cortex Motor Cortex refers to that part of the brain where nerve cells are engaged in planning and directing the actions …

Motivation Why do you eat? Why do you drink? What makes you do anything? The answer is motivation; a process that acts, …

Motivated Forgetting Motivated Forgetting is what Freud referred to as repressed memories. According to Freud, there are times when an event or …

Motion Parallax Motion Parallax provides perceptual cues about differences in distance and motion and is associated with depth perception. As an example, …