Our studies are unique in that we were able to compare measures of phase locking over a wide range of frequency bands during periadolescent to adult development in rats and compare their responses using a similar task to humans. In our studies both periadolescent rats and humans were found to have higher energy, and lower PDLI values than the adults of their species over a wide range of frequency bands. We found that although rats had similar findings to humans on measures of PLI, the results were not as robust and only occurred in the infrequently presented tone in one frequency band. One explanation of these findings is that the rats were only evaluated in a passive task. When we compared the results of our active and passive ERP tasks, in human subjects, we found that ERO energy and PDLI did not differ between tasks. However, PLI values were found to differ between the active and passive tasks with the frequently presented tone being less attended to in the active task. Taken together these data suggest that PLI values are
