SCRs were recorded from the hypothenar eminence of the left palmar surface using pregelled snap electrodes (BIOPAC EL509) connected to the BIOPAC MP-160 System (Goleta, CA). SCR data were considered valid to CS presentation if the trough-to-peak deflection occurred between 0.5 to 6 sec following CS onset, was greater than 0.02 µS, and lasted for a maximum 5 sec. Trials that did not meet these criteria were scored as zero. SCRs were processed using an automated analysis script implemented in Matlab (Green et al. 2013 (link)), and were visually inspected by research assistants blind to the experimental conditions. SCR data were square-root transformed prior to statistical analysis to normalize the distributions.