PsPM-trSP2 dataset
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Repository Version: 2019.03.11

This dataset includes skin conductance response (SCR) measurements for each of 40 healthy unmedicated participants (20 males and 20 females aged 21.9 +/- 3.8 years) in response to the 16 most arousing negative, the 16 most arousing positive (excluding explicit nude), and the 16 least arousing neutral IAPS pictures, presented for 1 s each in 1 block, while listening to regular or random distractor sounds, as described in Bach et al. (2015). ITI was 4.4 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:
- Dominik R. Bach & Karl J. Friston & Raymond J. Dolan (2013) An improved algorithm for model-based analysis of evoked skin conductance responses. Biological Psychology, 94:3, pp 490-497. DOI:10.1016/j.biopsycho.2013.09.010
- Dominik R. Bach (2014) A head-to-head comparison of SCRalyze and Ledalab, two model-based methods for skin conductance analysis. Biological Psychology, 103, pp 63-68. DOI:10.1016/j.biopsycho.2014.08.006
- Dominik R. Bach & Erich Seifritz & Raymond J. Dolan (2015) Temporally Unpredictable Sounds Exert a Context-Dependent Influence on Evaluation of Unrelated Images. PLoS One, 10:6, pp 1-14. DOI:10.1371/journal.pone.0131065

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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
 |-trSP2_spike_XX_snY.mat // 40 files holding measurements for SCR, ECG, and respiration
 |-trSP2_cogent_XX.mat    // 40 files holding key presses, IAPS information, and demographics

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Data Files:
- Files holding SCR, heart beat, and time markers, recorded with CED spike2 software.
  - Skin conductance (channel 1)
  - Event markers used for synchronization with Cogent files (channel 2)
- Files holding keyboard presses, and IAPS information, recorded with Cogent 2000 software. Also contains demographic (age, sex)

The data file name is composed of:
- trSP2        The dataset name
- spike/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 9.4 (R2018a) format.