Related by context. Frequent words. (Click for all words.) 67 synapses 63 nerve cells 62 neurons 58 neurones 57 visual cortex 56 cortex 56 brain 56 neural 55 synaptic 55 neuron 54 brain circuitry 54 neuronal 54 cognitive 54 hippocampus 53 synapse 53 plasticity 52 nerve fibers 52 cerebellum 52 axons 52 cognitive functions 51 cognition 51 frontal lobes 51 hair follicles 51 neurogenesis 51 dendrites 51 frontal lobe 50 cerebral cortex 50 basal ganglia 50 brainstem 50 Neurons 50 cognitive abilities 49 motor neurons 49 temporal lobe 49 prefrontal cortex 49 elastin 49 frontal cortex 49 cortical 48 neural networks 48 neural stem cells 48 myelin 47 fibroblasts 47 follicles 47 muscle fibers 47 skeletal muscle 47 cognitive functioning 46 BDNF 46 connective tissue 46 amygdala 46 photoreceptors 46 germ cells 46 progenitor cells 46 dopamine 46 brains 45 nerve endings 45 auditory 45 neurodegeneration 45 cognitive function 45 inhibitory 45 acetylcholine 45 muscle tissue 45 blood vessels 45 pancreatic cells 45 fatty tissue 45 striatum 45 axon 45 REM sleep 45 stimuli 44 perceptual 44 mutant mice 44 cognitive deficits 44 Brain scans 44 amyloid plaques 44 metabolic 44 cognitively 44 atrophy 43 astrocytes 43 neurotransmitters 43 glial cells 43 physiological 43 motor cortex 43 senescence 43 metabolic processes 43 neurobiological 43 facial muscles 43 metabolism 43 phenotype 43 dermis 43 physiologic 43 sweat glands 42 autonomic nervous system 42 muscles 42 behaviorally 42 DNA strands 42 telomeres 42 microtubules 42 melanin 42 collagen 42 cognitive decline 42 T lymphocytes 42 melanocytes 42 retina