Related by context. Frequent words. (Click for all words.) 55 acetylcholine 55 SIRT1 55 epithelium 53 secretion 53 inhibitory 53 ion channels 52 receptors 52 astrocytes 51 vasculature 51 gene expression 51 glutamate 51 neurotransmitter 50 nerve cells 50 receptor 50 glucose metabolism 50 cortical 49 neurogenesis 49 neurotransmitters 49 neurones 49 mitochondria 49 leptin 49 BDNF 49 ghrelin 48 hypothalamus 48 cortex 48 cochlea 48 neurons 47 amyloid beta 46 motor neurons 46 adrenal gland 46 striatum 46 testis 46 cerebellum 46 phenotype 46 visual cortex 46 Neurons 46 nerve fibers 46 neuronal 46 hippocampus 46 thalamus 45 photoreceptors 45 axon 45 blood vessels 45 dopamine 44 neuron 44 hair follicles 44 synapse 44 nerve impulses 44 plasticity 44 dermis 44 serotonin 43 insula 43 cilia 43 epidermis 43 myelin 43 cerebral cortex 43 synaptic 42 beta amyloid 42 brainstem 42 salivary glands 42 amyloid plaques 42 fatty tissue 42 axons 41 testes 41 frontal lobe 41 sweat glands 41 dendrites 40 follicles 40 macula 40 retina 40 cognitive functions 39 neural 39 brain 39 electrical impulses 39 circuitry 39 amygdala 39 temporal lobe 38 synapses 38 nerve endings 38 prefrontal cortex 37 Brain scans 37 frontal lobes 37 dorsal 37 nasal cavity 36 excitation 36 electrical pulses 36 cognition 35 retinas 35 optic nerve 33 olfactory 33 brains 32 imaging fMRI 32 cognitive functioning 30 lobe 29 neural networks 29 cognitive 29 fMRI 28 REM sleep 27 sensory 26 auditory 23 perceptual