This dataset includes pupil size response (PSR), skin conductance response (SCR), electrocardiogram (ECG) and respiration measurements. Also included are CS and US information, keypress responses, keypress response times, key correctness and shock expectancy ratings at the end of the experiment for 74 healthy unmedicated participants (33 males and 41 females aged 24.2+/-3.9 years) participating in a 3 conditions x 3 experimental sessions repeated-measures design to assess the return of fear. CS were colored triangles (yellow/red/blue). US consisted of a 500 ms train of 250 square pulses with individual pulse width of 0.2 ms. SOA between the CS onset and US was 3.5 s. CS and US co-terminated. The ITI was randomly determined as discrete values between 7-11 seconds (mean 9 seconds).

Raw data are contained in data.zip and described in readme.txt. Pre-processed data are contained in data_pp.zip and described in readme_pp.txt. Data are stored as .mat files for use with MATLAB (The MathWorks Inc., Natick, USA) in a format readable by the PsPM toolbox (bachlab.org/pspm). All raw data files are saved in MATLAB 9.2 (R2017a) format, and all pre-processed data files are saved in MATLAB 9.6 (R2019a) format. This research was supported by Wellcome Trust grant 091593/Z/10/Z. Data pre-processing was supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant agreement No. ERC-2018 CoG-816564 ActionContraThreat)