Affect is a psychological term for an observable expression of emotion. A person's affect is the expression of emotion or feelings displayed to others through facial expressions, hand gestures, voice tone, and other emotional signs such as laughter or tears. Individual affect fluctuates according to emotional state.
There are over 3,000 different species of cockroaches-some are considered pests while others are beneficial in their natural environment. The three main types of cockroaches commonly found in homes in South Africa include the German cockroach, Oriental cockroach and American cockroach.
There are many different types of roaches throughout the world, based on the regions they dwell in. Cockroaches can inhabit inside the home, outside the home, or both. If a roach prefers to dwell outside it is called a feral roach. The feral roaches still may end up inside the home but their survival is independent of humans. Next are the peridomestic roaches that can survive inside or outside the home.