<Dl> <Dd> The increase in skill or retention of information may increase rapidly to its maximum rate during the initial attempts, and then gradually levels out, meaning that the subject's skill does not improve much with each later repetition, with less new knowledge gained over time . </Dd> </Dl> <Dd> The increase in skill or retention of information may increase rapidly to its maximum rate during the initial attempts, and then gradually levels out, meaning that the subject's skill does not improve much with each later repetition, with less new knowledge gained over time . </Dd> <Ul> <Li> Power law </Li> </Ul> <Dl> <Dd> This is similar in appearance to an Exponential decay function, and is almost always used for a decreasing performance metric, such as cost . (Fig 6) It also has the property that if you plot the logarithm of proficiency against the logarithm of experience the result is a straight line, and it is often presented that way . </Dd> </Dl>

Which of the following could have caused curve b to be different from curve a