“One more time”: time loops as a tool to investigate folk conceptions of moral responsibility and human agency

In the past 20 years, experimental philosophers have investigated folk intuitions about free will and moral responsibility, and their compatibility with determinism. To determine whether laypeople are “natural compatibilists” or “natural incompatibilists”, they have used vignettes describing agents living in deterministic universes. However, later research has suggested that participants’ answers to these studies are plagued with comprehension errors: either people fail to really accept that these universes are deterministic, or they confuse determinism with something else. This had led certain experimenters to conclude that maybe folk intuitions about the compatibility of free will with determinism could not be empirically investigated. Here, we propose that we should refrain from embracing this pessimistic conclusion, as scenarios involving time loops might allow experiments to bypass most of these methodological issues. Indeed, scenarios involving time loops belong both to the philosophical literature on free will and to popular culture. As such, they might constitute a bridge between the two worlds. We present the results of five studies using time loops to investigate people’s intuitions about determinism, free will and moral responsibility. The results of these studies allow us to reach two conclusions. The first is that, when people are introduced to determinism through time loops, they do seem to understand what determinism entails. The second is that, at least in the context of time loops, people do not seem to consider determinism to be incompatible with free will and moral responsibility. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s11229-023-04245-9.