1) Emotional: when someone is too overwhelmed to emotionally deal with the information (news) just received
2) Intellectual: when someone is too confused to input or comprehend the information (knowledge) just received (reviewed)
1) Emotional: Jane got brain-wacked when she found out that her boyfriend
Dick had slept with Lilith.
2) Intellectual: The CEO was brain-wacked when he read how low the numbers were in the quarterly sales report.