The mean and standard deviation for each group of rats are as follows:

For the no-lesion group, M= ****, SE= **** . For the right side lesion group, M= **** , SE= ****. For the left side lesion group, M= ****, SE=****, and for the rats with lesions on both sides, M= ****, SE= ****.

Main Analysis

To investigate the hypotheses of interest, ANOVA was performed, with comparisons for each of the three hypotheses. The result of the overall F tests was significant (F(****,****)= ****, p<****). Results of the comparisons also showed support for the hypothesis that there is a statistically significant difference between rats with right and left side lesions, t(****)=****, p=****. This p-value was statistically significant, even after using Dunn's method to adjust alpha to **** in order to control for the increase in error rates. Further, there is support for the third hypothesis that the performance of rats with lesions on either side is statistically significantly different than the performance of rats without lesions (t(****)= ****, p<****). The second hypothesis, that rats with lesions on either side perform differently than rats with lesions on both sides, was not supported, t(****)= ****, p=****. We were surprised that the mean performance of rats with lesions on both sides was better than rats with lesions on the left side only, and ran a post-hoc comparison to investigate whether or not this difference was statistically significant. Even before adjusting for error rates using Scheffe's method, it was not (t(****)=****, p=****).