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.
Field cockroaches are normally found outdoors in leaf litter or other plant debris. They are usually only found inside the home during early summer when it is hot and dry. Adult oriental cockroaches are glossy dark brown to black. Females may be nearly 1-1/4 inches long, while males are 1 inch long.