It wasn't an experiment to see how people were able to recognize different animals at different times of the day. They were deliberately altering people's moods

It wasn't an experiment to see how people were able to recognize different animals at different times of the day. They were deliberately altering people's moods just to see if they could. That may not sound like much but considering they did it over thousands of people, there's no telling the cumulative effects over people's mental health as a result of their poorly managed experiment.