Carl Jung noted that the snail was representative of the self in dreams. In psychology, the soft insides are analogous to the subconscious, as the shell is the conscious.
Alpha waves are associated with an idle state, and present while awake and relaxing, with eyes closed. Alpha waves are reduced if you open your eyes, or become drowsy or fall asleep.
Beta waves are associated with active, wakeful states of consciousness, such as working, alertness, concentration and even anxious thoughts.
Delta waves are associated with deep sleep and occur mostly during NREM (non-rapid eye movement) sleep. Healthy adults do not have large amounts of delta wave activity while in the awake state. Studies indicate increased delta activity when intoxicated, or in states of delirium, dementia, or schizophrenia.
Gamma waves are continuously present during the process of awakening and during REM sleep (rapid eye movement). When you observe an object, the size, texture, color, weight etc. are all perceived and processed by different parts of the brain. It is theorized that gamma waves allow the brain to unify all the different information it gathers. States of self awareness, higher levels of insight, psychic abilities and out of body experiences are also associated with gamma waves synthesizing bits of individual data from various areas of the brain, bringing them all together into a higher perspective.
Theta waves are associated with states of quiet focus and some sleep states. Psychic and meditative states, involve a combination of alpha and theta brain waves.
I shall not commit the fashionable stupidity of regarding everything I cannot explain as a fraud." - C.G.Jung