I’ve only read a distillation of the experiments (which had the same “because” I used) but not the papers themselves. The distillation mentioned that the scientists conducted interviews with the participants (whatever that’s worth) and that this was their interpretation of a broad category of results from several similar experiments. I don’t know if there were actual efforts to exclude signaling etc. See Lehrer, How We Decide, Ch. 5 for more detail.
I’ve only read a distillation of the experiments (which had the same “because” I used) but not the papers themselves. The distillation mentioned that the scientists conducted interviews with the participants (whatever that’s worth) and that this was their interpretation of a broad category of results from several similar experiments. I don’t know if there were actual efforts to exclude signaling etc. See Lehrer, How We Decide, Ch. 5 for more detail.