Answer: Automatic, implicit prejudice.
Step-by-step explanation:
Implicit prejudice commonly described the prejudice that is, the negative feelings or beliefs about a group that is held by people without them being aware of it. It is an attitude that one may not be aware of and can't report directly.
Automatic, implicit prejudice exists when we unknowingly associate stereotypes and hold attitudes towards others. From the question, the participants shot mostly blacks, this shows that the participants have an automatic, implicit prejudice.