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These are stimulating times for anyone interested in questions of animal consciousness. On what seems like a monthly basis, scientific teams announce the results of new experiments, adding to a preponderance of evidence that we’ve been underestimating animal minds, even those of us who have rated them fairly highly. New animal behaviors and capacities are observed in the wild, often involving tool use—or at least object manipulation—the very kinds of activity that led the distinguished zoologist Donald R. Griffin to found the field of cognitive ethology (animal thinking) in 1978: octopuses piling stones in front of their hideyholes, to name one recent example; or dolphins fitting marine sponges to their beaks in order to dig for food on the seabed; or wasps using small stones to smooth the sand around their egg chambers, concealing them from predators. At the same time neurobiologists have been finding that the physical structures in our own brains most commonly held responsible for consciousness are not as rare in the animal kingdom as had been assumed. Indeed they are common. All of this work and discovery appeared to reach a kind of crescendo last summer, when an international group of prominent neuroscientists meeting at the University of Cambridge issued “The Cambridge Declaration on Consciousness in Non-Human Animals,” a document stating that “humans are not unique in possessing the neurological substrates that generate consciousness.” It goes further to conclude that numerous documented animal behaviors must be considered “consistent with experienced feeling states.”

The Dunbar number is actually a series of them. The best known, a hundred and fifty, is the number of people we call casual friends—the people, say, you’d invite to a large party.

On an even deeper level, there may be a physiological aspect of friendship that virtual connections can never replace. This wouldn’t surprise Dunbar, who discovered his number when he was studying the social bonding that occurs among primates through grooming. Over the past few years, Dunbar and his colleagues have been looking at the importance of touch in sparking the sort of neurological and physiological responses that, in turn, lead to bonding and friendship. “We underestimate how important touch is in the social world,” he said.

So what happens if you’re raised from a young age to see virtual interactions as akin to physical ones? “This is the big imponderable,” Dunbar said. “We haven’t yet seen an entire generation that’s grown up with things like Facebook go through adulthood yet.”

Melissa McCracken grew up with a neurological condition that means she processes songs as colors—a gift that translates into paintings inspired by her favorite musicians.

ARE you responsible for your behavior if your brain “made you do it”?Often we think not. For example, research now suggests that the brain’s frontal lobes, which are crucial for self-control, are not yet mature in adolescents. This finding has helped shape attitudes about whether young people are fully responsible for their actions. In 2005, when the Supreme Court ruled that the death penalty for juveniles was unconstitutional, its decision explicitly took into consideration that “parts of the brain involved in behavior control continue to mature through late adolescence.”

The researcher who met with S. that day was twenty-seven-year-old Alexander Luria, whose fame as a founder of neuropsychology still lay before him. Luria began reeling off lists of random numbers and words and asking S. to repeat them, which he did, in ever-lengthening series. Even more remarkably, when Luria retested S. more than fifteen years later, he found those numbers and words still preserved in S.’s memory. “I simply had to admit that the capacity of his memory had no distinct limits,” Luria writes in his famous case study of S., “The Mind of a Mnemonist,” published in 1968 in both Russian and English.