Box plots of the classification performance achieved on the six tasks. Each plot corresponds to one of the six tasks, and nine different data sets are generated by using different thresholds for the fold enrichment and different image sections (coronal, sagittal, and coronal + sagittal). For each task, the entire data set is randomly partitioned so that 2/3 of the data is in the training set and the rest 1/3 is in the test set. A total of 30 random partitions are generated. The central mark represents the median, the edges of the box denote the 25th and 75th percentiles. The whiskers extend to the minimum and maximum values not considered outliers, and outliers are plotted individually. The numbers of genes used for different tasks are given in Table 1.