Abscesses occur when an area of tissue becomes infected and the body's immune system tries to fight it. White blood cells move through the walls of the blood vessels into the area of the infection and collect within the damaged tissue. During this process, pus forms.
cognition cogÂ·niÂ·tion (kÅg-nÄ­sh'Én) n. The mental faculty of knowing, which includes perceiving, recognizing, conceiving, judging, reasoning, and imagining.
Cognitive psychology is the scientific investigation of human cognition, that is, all our mental abilities â perceiving, learning, remembering, thinking, reasoning, and understanding. The term âcognitionâ stems from the Latin word â cognoscereâ or to know.