PsPM-LI dataset
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Repository Version: 2018.06.13

This dataset includes pupil size response (PSR), skin conductance response (SCR), electrocardiogram (ECG) and respiration measurements for each of 20 healthy unmedicated participants (8 males and 12 females aged 22.8+/-3.3 years) participating in a classical (Pavlovian) discriminant delay fear conditioning task. (One additional participant in the initial sample in Korn et al. (2017) - but who did not finish the experiment and was not included into the analysis - is not contained in this dataset.) The acquisition data is separated into two sessions which were recorded consecutively with a break of approximately 5 min. CS consist of two sine tones with constant frequency (220 Hz or 440 Hz, 50-ms onset and offset ramp) and last for 6.5 s. US is a 0.5 s 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 6 s. The ITI is 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:
- 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
- Giuseppe Castegnetti & Athina Tzovara & Matthias Staib & Samuel Gerster & Dominik R. Bach (2017) Assessing fear learning via conditioned respiratory amplitude responses. Psychophysiology, 54:2, pp 215-223. DOI:10.1111/psyp.12778

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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
|-LI_pupil_XX_snY.mat      // 40 files holding pupil measurements
|-LI_wdq_XX_snY.mat        // 40 files holding measurements for SCR, 
                           // ECG and respiration
|-LI_cogent_XX.mat         // 20 files holding 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, markers 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, respiration traces and time markers, recorded with
  WDQ software.
   - Skin conductance (channel 1)
   - Electrocardiogram (channel 2)
   - Respiration (channel 3)
   - Event markers used for synchronization with Cogent files, markers are set
     at CS presentation onset (channel 4)
- Files holding CS/US information, recorded with Cogent 2000 software.

The data file name is composed of:
 - LI               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 9.3 (R2017b) format.