PsPM-SC4B dataset
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Repository Version: 2017.11.09

This dataset includes pupil size response (PSR), skin conductance response (SCR), electrocardiogram (ECG), electromyogram (EMG) and respiration measurements. Also included are CS and US information, keypress responses, keypress response times, key correctness and shock ratings for each of 21 healthy unmedicated participants (10 males and 11 females aged 22.9+/-3.0 years; discrepancies to published studies are due to misprints and exclusion of a subject with incomplete data, which was excluded in all conducted studies as well as here) participating in a classical (Pavlovian) discriminant delay fear conditioning task. Two pairs of CS+ and CS-, either complex or simple, were delivered with headphones (HD518, Sennheiser, Wedemark-Wennebostel, Germany) at about 68 dB. Complex stimuli were a sequence of four rising (400 to 800 Hz) or falling (800 to 400 Hz) sounds lasting 1 s each. Simple stimuli were tones with constant frequency (400 or 800 Hz) presented for 4 s. US consisted of square electric pulses with 0.2-ms duration and 10 Hz frequency, resulting in a total US duration of 0.5 s. SOA betwen the CS and US was 3.5 s. The ITI was randomly determined on each trial to be 7, 9, or 11 s.

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This repository is curated by the PsPM team, pspm.sourceforge.net

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Dataset is described and used in following references:
- Giuseppe Castegnetti & Athina Tzovara & Matthias Staib & Philipp C. Paulus & Nicolas Hofer & Dominik R. Bach (2016) Modeling fear-conditioned bradycardia in humans. Psychophysiology, 53:6, pp 930-939. DOI:10.1111/psyp.12637
- Christoph W. Korn & Matthias Staib & Athina Tzovara & Giuseppe Castegnetti & Dominik R. Bach (2017) A pupil size response model to assess fear learning. Psychophysiology, 54:3, pp 330-343. DOI:10.1111/psyp.12801

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File Structure:
-README.txt               // This document
-excludes.txt             // List of excluded subjects for specific publications
-+Data                    // Folder Containing all data files
 |-SC4B_pupil_XX_snY.mat  // 21 files holding pupil measurements
 |-SC4B_wdq_XX_snY.mat    // 21 files holding measurements for SCR, ECG, EMG and respiration
 |-SC4B_cogent_XX.mat     // 21 files holding keyboard presses and CS/US information
 |-...

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Data Files:
- Files holding pupil traces and time markers, recorded with Eyelink software.
   - Event markers used for synchronization with Cogent files, marker are set at CS presentation onset (channel 1)
   - Pupil size for left pupil (channel 2)
   - Gaze coordinate x for left pupil (channel 3)
   - Gaze coordinate y for left pupil (channel 4)
   - Pupil size for right pupil (channel 5)
   - Gaze coordinate x for right pupil (channel 6)
   - Gaze coordinate y for right pupil (channel 7)
- Files holding SCR, ECG, EMG, respiration traces and time markers, recorded with WDQ software.
   - Skin conductance (channel 1)
   - Electromyogram (channel 2)
   - Electrocardiogram (channel 3)
   - Respiration (channel 4)
   - Event markers used for synchronization with Cogent files, markers are set at CS presentation onset (channel 5)
- Files holding keyboard presses and CS/US information, recorded with Cogent 2000 software.

The data file name is composed of: 
 - SC4B        		The dataset name
 - pupil/wdq/cogent The type of data recorded (see above)
 - XX           	The subject number
 - Y           	  The session number

Data are stored as .mat files for use with MATLAB (The MathWorks Inc., Natick, USA) in a format readable by the PsPM toolbox (pspm.sourceforge.net). All matlab files are saved in MATLAB 9.2 (R2017a) format.