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.
perception noun [C or U]. âº the way that someone âthinks and âfeels about a âcompany, âproduct, âservice, etc.: Although our âhandling of âcomplaints has âimproved greatly, it continues to be a significant problem in âterms of âpublic perception.