Consider the research of Ingham and colleagues (1974), in which blindfolded people were led to believe they were pulling a rope with others. What did the researchers find about the effort expended by those blindfolded participants?
1) Compared to those pulling alone, they did not pull as hard.
2) Compared to those pulling alone, they pulled harder.
3) Compared to those pulling alone, they pulled as hard during their peaks of effort, but they took more rests.
4) Compared to those pulling alone, they pulled as hard during their peaks of effort, but they took fewer rests.