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The idea first began circulating in the neuroscience community after some split-brain patients exhibited the alien hand syndrome , which led some scientists to believe that there must be two separate consciousnesses within the brain 's left and right hemispheres in competition with one another once the corpus callosum is severed .
 alien hand syndrome
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 alien hand syndrome