The whole study will be conducted in Polish language (with the exception of the original video).
All the instructions had been translated to Polish by one of the experimenters and after that the Polish translations were given to fluent English speaker to reverse translation back to English. The independent translator was blind to the study topic.
A computer will be used to display all instructions, the film and lineup picture as a PowerPoint presentation. This will allow controlling the exact display time. The answers will be given in paper-and-pencil mode.