Unlike the octopus's arms, which that animal often uses to move and carry ... The cuttlefish has one of the largest brain-to-body size ratios of any invertebrate, perhaps even larger than that ...

Researchers showed that only the right-brain side of the amygdala is involved in processing images of animals—in terms or fear, aversion, or affection—highlighting the importance animals throughout ...

“We don’t have a precise definition of a brain,” he said. Scientists home in on the brain’s evolutionary origins by sorting out the animals without brains. Sponges have no neurons, so they are easy to ...

Small animal phobia, which involves an intense ... demonstrating its ability to differentiate phobic individuals based on their brain anatomy. Several key brain regions emerged as pivotal in ...