High-span people show more interference on the Brown-Peterson task than do low-span people

A rat is placed in a box where the lever works every fourth time. This is a _____

schedule. (a) fixed interval (b) variable interval (c) fixed ratio (d) variable ratio

People with bipolar disorder that is described as ‘rapid cycling' experience four or more manic or depressive episodes in a 12-month period

Indicate whether this statement is true or false.