![]() ![]() Those expectations came in part from work on other mammals’ brains. Using a molecule that attaches selectively to neurons in this slurry, researchers could count the number of neurons in each bit of brain real estate.įor most animals, the team found the expected numbers of neurons, given a certain brain size. For each animal, the researchers whipped up batches of “brain soup,” tissue dissolved in a detergent. Neuroscientist Suzana Herculano-Houzel of Vanderbilt University in Nashville and colleagues gathered brains from the different species of carnivores. “It shows us that there’s a lot more out there that we need to study to really be able to understand the evolution of brain size and how it relates to cognition,” she says. ![]() For now, the multispecies tally raises more questions than it answers, says zoologist Sarah Benson-Amram of the University of Wyoming in Laramie. ![]()
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