15455
For example , it has been suggested that language deficits in expressive aphasia may be caused by excessive competition between lexical units , thus preventing any word from becoming sufficiently activated .
 expressive aphasia
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:
 expressive aphasia