The dataset consist 360 photographic images of scenes of different emotional valence: positive, negative, and neutral - 120 pictures for each category. The images were obtained from open sources and estimated as positive, negative, or neutral by group of independent experts. All of the images were equalized in size, average brightness and RMS contrast.
Example:
![Neutral][1]
[1]: http://disk.yandex.ru/i/3rnJoBe8h7JruA
scenes360.py is a Python+PsychoPy example of simple ERP experiment with demonstration and evaluation of stimuli by scaling them with three rating options: negative, neutral and positive.