16536
The error - related negativity ( ERN ) and error positivity ( Pe ) , ERPs sensitive to performance monitoring , were recorded from 30 frequent cannabis users ( mean usage = 5 . 52 days / week ) and 32 cannabis - na i ve control participants during a speeded stimulus discrimination task .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None