Related by context. Frequent words. (Click for all words.) 79 synapse 78 neurons 73 neuron 72 synaptic 71 nerve cells 66 neuronal 66 cortex 63 neural 61 neurotransmitters 61 cerebral cortex 61 hippocampus 61 brain 60 cerebellum 60 dopamine 59 plasticity 58 neurotransmitter 57 nerve fibers 57 BDNF 57 axons 57 cortical 56 mitochondria 55 amygdala 55 inhibitory 55 serotonin 54 nerve endings 54 muscle fibers 54 glutamate 54 cognitive functions 54 astrocytes 54 nuclei 54 prefrontal cortex 53 motor neurons 52 proteins 52 brains 51 receptors 51 frontal lobe 51 myelin 51 ion channels 50 hypothalamus 50 genes 50 cognition 50 norepinephrine 50 metabolism 50 neurodegeneration 50 microtubules 50 protein synthesis 50 auditory 50 filaments 49 magnetic fields 49 cell membrane 49 GABA 49 collagen 49 molecules 49 vesicles 48 skeletal muscle 48 cognitive 48 cognitive abilities 47 perceptual 47 amino acids 47 cell membranes 47 retinas 47 circuitry 47 amyloid beta 47 chromatin 47 hair follicles 47 muscles 47 blood vessels 47 cilia 47 electrical impulses 47 fibroblasts 47 stress hormones 47 atoms 47 signaling pathways 46 signaling pathway 46 sensory 46 cortisol 46 stimuli 46 amino acid 46 tau 46 amyloid 46 metabolic 46 REM sleep 46 excitation 46 photons 46 molecule 46 intracellular 46 electrons 46 nucleotides 46 muscle tissue 46 actin 45 olfactory 45 facial muscles 45 leptin 45 epidermis 45 gene 45 circadian 45 capillaries 45 ghrelin 45 neurobiology 45 phosphorylation 45 molecular