Related by context. Frequent words. (Click for all words.) 74 brain 57 cortex 55 prefrontal cortex 54 Brain 52 synapses 51 neural 49 brainpower 49 neurons 48 livers 48 cognitive 48 Brains 48 brain scans 47 cognition 47 hippocampus 46 cognitive abilities 46 neuron 46 amygdala 45 minds 45 auditory 45 psyches 45 muscles 45 insides 45 nerve cells 45 intellect 44 functional magnetic resonance 44 testes 44 olfactory 43 mitochondria 43 ovaries 43 neuroscientists 43 IQs 43 neuroscientist 43 blood vessels 43 internal organs 42 ears 42 lungs 42 fMRI 42 stomachs 41 intestines 41 skulls 41 retina 41 neurological 40 optic nerve 40 reflexes 40 penises 40 boffins 40 mice 40 innards 40 neuronal 40 sensory 40 egos 40 senses 40 testicles 39 taste buds 39 beaks 39 hair follicles 39 circuitry 39 cerebral 39 psyche 39 eardrums 39 subconscious 39 monkeys 39 metabolic 39 muscle tissue 38 innate 38 gut 38 muscle 38 arteries 38 hearts 38 spines 38 anatomy 38 vocal chords 38 mind 38 physiological 38 stress hormones 38 nerve fibers 38 whiskers 38 mouths 38 stimuli 38 intuition 38 entrails 38 kidneys 38 sleep deprived 37 physiology 37 perceptual 37 organs 37 dopamine 37 noggin 37 hormones 37 cognitive function 37 comprehension 37 metabolism 37 facial expressions 37 eyelids 37 sperm 37 eyeballs 37 liver 37 rats 37 serotonin 36 ego 36 gills