Congrats to Dr. Milenna van Dijk on successfully defending her thesis and on her Neuron paper!
Dentate gyrus neurons signal distinct memories and memory-related information by sub-second patterns of strong, weak, and independent co-firing, that are transiently enhanced by increased co-firing between excitatory and inhibitory cells. They don't signal distinct memories by remapping.
This is conceptually similar to the behavior of a large flock of flying starlings. The flock can take on many complex patterns while maintaining its cohesion as a flock. Different flock patterns occur when just a small number of starlings change course, responding for example, to avoid a threat, such as a predatory hawk. Similarly, transient increases of excitatory-inhibitory co-firing can signal memory discrimination within the globally-maintained spatial tuning and scale-free correlation structure of the discharging population of dentate place cells.