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.
1 The German and Asian roach look very similar. One difference used to distinguish them is the Asian roach is a good flier and the German roach isnât.  The Brown-banded cockroach is also known as the TV cockroach. It can live in the back of TV sets and other appliances where it is warm.