A tibble with the following column names:
"id" = id column;
"top10per" = mean of top 10
"bottom10per" = mean of bottom 10
"minfirst = all trials minus the first one;
"all" = mean of all trials;
"t33per = mean of top 33
"m33per" = mean of medium 33
"b33per" = mean of bottom 33
"fhalf" = mean of first half of the trials;
"lhalf" = mean of last half of the trials;
"ftrial" = first trial;
"ltrial" = last trial;
"t20per" = mean of top 20
"b20per" = mean of bottom 20
"f2trial" = mean of first two trials;
"l2trial" = mean of last two trials;
"per2_X" = mean per two trials (i.e., block), with X referring to the number
of block.