Wasn't there a mutation in humans that increased the max. connections per neuron, with the cost of more, uh, faulty products?

Edit: asked ChatGPT, confirmed it somewhat but can't search the net.

The study you are referring to might be related to research on the evolution of the human brain and the structural differences in neurons compared to other primates. One notable study published in 2012 by a team led by neuroscientist Suzana Herculano-Houzel found that humans have a higher number of connections per neuron in the cerebral cortex compared to other primates.