Related by context. Frequent words. (Click for all words.) 40 brains 35 neuroscientists 33 mice 32 brain scans 31 rats 30 boffins 29 IQs 29 brainpower 28 sleep deprived 27 cognition 27 innate 27 cognitive 26 monkeys 26 neuroscientist 26 prefrontal cortex 25 functional magnetic resonance 25 cognitive abilities 25 livers 24 neural 24 testes 23 perceptual 23 stimuli 23 brain 23 fMRI 22 minds 21 auditory 21 anatomy 21 facial expressions 21 physiology 21 comprehension 20 penises 20 Brains 20 nerve cells 20 stress hormones 20 olfactory 20 hormones 20 cognitive function 19 Brain 19 amygdala 19 dopamine 19 psyches 19 hippocampus 19 neurons 19 stomachs 18 intuition 18 sperm 18 subconscious 18 serotonin 18 hearts 18 arteries 18 innards 18 cortex 18 insides 17 intellect 17 egos 17 taste buds 17 physiological 17 reflexes 17 eyeballs 16 nerve fibers 16 circuitry 16 organs 15 synapses 15 blood vessels 14 neuronal 14 beaks 14 kidneys 14 cerebral 14 metabolism 14 skulls 14 sensory 13 ovaries 13 muscles 13 metabolic 13 senses 13 mitochondria 13 spines 13 gills 12 mouths 12 neuron 12 muscle 11 liver 11 neurological 11 internal organs 11 mind 9 psyche 9 muscle tissue 9 hair follicles 9 lungs 9 whiskers 9 eyelids 9 ego 9 retina 8 ears 8 gut 7 testicles 7 intestines 6 optic nerve 6 eardrums 3 vocal chords 0 noggin