What Does the Out-Of-Africa Model Assert

question 23

Multiple Choice

What does the Out-of-Africa model assert?

• A)a single origin of modern people and eventual replacement of archaic Homo sapiens throughout Africa,Asia,and Europe
• B)the importance of gene flow across population boundaries
• C)migrations of australopithecines came out of Africa
• D)migrations of Homo habilis came out of Africa

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Definitions:

Postreinforcement Pause

A pause in responding that commonly occurs after the delivery of a reinforcer under certain schedules of reinforcement, such as a fixed ratio schedule.

FR-5 Schedule

A fixed-ratio schedule of reinforcement where a response is rewarded only after five instances of the behavior.

FR-15 Schedule

A fixed-ratio schedule of reinforcement where a response is reinforced only after it has been produced 15 times.

Fixed-Ratio

A reinforcement schedule where a response is reinforced only after a specified number of responses.