According to a 17th-century European fantasy, certain sponges were used in the South Seas to record and transmit sound. A message spoken into one of these sponges would be exactly replayed when a recipient squeezed it appropriately, even across great distances in time and space. It's hard for us to remember just how magical it is, in a natural world made up solely of warring elements, that any information can be enduringly stored, transported without distortion, and precisely reproduced. Our lives (...) are irretrievably tangled with artificial systems which keep their contents ordered and immune from melding, and we trust that our computers won't creatively blend our files overnight. But despite our best efforts to tidy our own minds, the blurry and insistently productive operations of human memory, in contrast, often resist both control and understanding. (shrink)

The relationship between topological explanation and mechanistic explanation is unclear. Most philosophers agree that at least some topological explanations are mechanistic explanations. The crucial question is how to make sense of this claim. Zednik (Philos Psychol 32(1):23–51, 2019) argues that topological explanations are mechanistic if they (i) describe mechanism sketches that (ii) pick out organizational properties of mechanisms. While we agree with Zednik’s conclusion, we critically discuss Zednik’s account and show that it fails as a general account of how and (...) when topological explanations are mechanistic. First, if topological explanations were just mechanism sketches, this implies that they could be enriched by replacing topological terms with mechanistic detail. This, however, conflicts how topological explanations are used in scientific practice. Second, Zednik’s account fails to show how topological properties can be organizational properties of mechanisms that have a place in mechanistic explanation. The core issue is that Zednik’s account ignores that topological properties often are _global_ properties while mechanistic explanantia refer to _local_ properties. We demonstrate how these problems can be solved by a recent account of mechanistic completeness (Craver and Kaplan in Br J Philos Sci 71(1):287–319, 2020; Kohár and Krickel in Calzavarini and Viola (eds) Neural mechanisms—new challenges in the philosophy of neuroscience, Springer, New York, 2021) and use a multilayer network model of Alzheimer’s Disease to illustrate this. (shrink)