This dataset includes skin conductance response (SCR) and pupil size response (PSR) measurements. Also included are CS and US information, keypress responses, keypress response times and key correctness for each of 18 healthy unmedicated participants (10 males and 8 females aged 25.7+/-5.0 years) participating in a classical (Pavlovian) discriminant delay fear conditioning task. Simple and complex CS are delivered to the intermediate phalanges of the index and middle fingers of the non-dominant hand. Simple stimuli are stimulations to either index or middle finger, complex stimuli are stimulations of different temporal structure to both index and middle fingers. CS intensity is set to a perceivable but not unpleasant level. US is a train of electric square pulses delivered with a constant current stimulator (Digitimer DS7A, Digitimer, Welwyn Garden City, UK) on participants' dominant forearm through a pin-cathode/ring-anode configuration. SOA between the CS and US is 3.5 s. The ITI is randomly determined on each trial to be 7, 9, or 11 s.

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, and Swiss National Science Foundation grant 320030_149586/1. 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).