“Once dismissed as too small-brained or simple to support experience, insects are now known as capable of remarkably complex tasks, including associative learning, context-sensitive decision-making and cross-modal sensory integration,” said Dr. Thomas White, an evolutionary ecologist and entomologist at the University of Sydney, and his colleagues.

“Recent studies have also identified brain regions such as the mushroom bodies and central complex that appear to support evaluative processing functionally analogous to that seen in vertebrates.”

“Yet the question of pain in insects cannot be settled by neural architecture alone.”

“Given the diversity of nervous systems across phyla, and the sheer creative power of adaptive evolution showcased via multiple realizability, behavior remains our most direct and inclusive route to inferring experience.”

“That is, rather than asking whether an animal has the same hardware, the more relevant question is whether it shows a comparable behavioral profile under similar conditions.”

In their research, the authors tested 80 adult house crickets in a carefully controlled experiment designed to rule out simple reflexes.