Residual effects on consciousness referred to abnormalities in memory, perception, or behavior caused when an individual's consciousness was affected to some degree by intense stimulation or external interference.
Being clubbed over the head clearly met the condition of "intense stimulation or external interference inflicted on the body."
After being clubbed over the head, a victim could experience temporary or long-term memory loss, particularly of events shortly before the attack. This phenomenon was usually associated with damage to the brain's hippocampus. The victim could also experience negative emotions such as anxiety, fear, and depression, as changes in neurotransmitter levels affected emotional regulation. With the transmission speed of the brain's neurons affected, the victim might react sluggishly for some time, unable to make quick judgments or respond promptly.
Even after the incident was over, these effects could persist. The victim might repeatedly relive the experience of being clubbed over the head, whether awake or dreaming, as the brain attempted to process that unresolved memory. This phenomenon was often referred to as post-traumatic stress disorder (PTSD).
In short, being clubbed over the head could leave a victim with a range of residual effects on consciousness. These might fade naturally in the short term, or they might stay with the victim for life, becoming painful memories that could never be erased.
Clearly, today's experience was very likely to become a memory Shigure Ryoko could never erase for the rest of her life.
With her hands and feet bound, Shigure Ryoko struggled to open her eyes in the darkness. Her head hurt as though it were splitting apart, as though millions of needles were stabbing into her brain. She desperately tried to remember, only to find that her memories seemed to have been smashed by a club, leaving scattered fragments she could barely piece