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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,…