The bootstrapping technique (Efron and Tibshirani 1993) was used to obtain confidence intervals of the response time courses and amplitudes for each visual area and subject. A single bootstrap sample was made as follows. First, we randomly chose runs with replacement from all the runs of each subject. Then, from the fMRI and behavioral **data** sets of the chosen runs, we deconvolved fMRI responses time courses and estimated the response amplitudes in the same way as for the original **data** sets. This procedure was repeated 10,000 times, and then 95% confidence intervals were obtained from the resulting distribution.