
The halo effect is a cognitive bias whereby the perception of one trait (i.e. a characteristic of a person or object) is influenced by the perception of another trait (or several traits) of that person or object. An example would be judging a good-looking person as more intelligent.
Edward Thorndike was the first to support the halo effect with empirical research. In a psychology study published in 1920, Thorndike asked commanding officers to rate their soldiers; he found high cross-correlation between all positive and all negative traits. People seem not to think of other individuals ...