Distribution of error types for first error made (including "No Error") in the first and last 10-trial blocks of testing. Distributions for shams are shown on the left, MG on the right. Distributions for the first 10-trial block distribution are shown at the top, and the last 10-trial block distribution at the bottom. No differences were observed in the distribution of errors between MG and shams for any of the 10 trial Blocks. While there was an obvious increase in the number of rats making "No Error," the distribution of First Errors (when the rat made an error) also changed between the first and last 10 trials, with an increase in the percentage of rats choosing either an Adjacent arm or the Prior goal arm.