The forthcoming film sees Knoxville and other castmembers perform a variety of elaborate and dangerous stunts, including one in which Knoxville is knocked into the air by a bull.
“Yeah, I got a brain haemorrhage from that,” he said. “So my cognitive abilities were in steep decline after that hit.”
Stern asked what the 50-year-old performer’s family made of his decision to return to the Jackass franchise.
“No one in my family is happy with the stunts and the bull hit was the worst hit I’ve ever taken from a bull or, maybe, period,” he replied. “Like I said my cognitive abilities really declined.
“I remember taking some tests, the neurosurgeon said ‘do you have trouble paying attention right now?’ I said ‘yeah, why?’ He goes: ‘Because you scored a 17 on my attention... that’s out of 100’.”
Knoxville revealed that he underwent “all these types of treatments”, including “transcranial magnetic stimulation, in which they buzz your head with these magnets for about 30 minutes at a time”.
“It’s supposed to help with depression and help with my cognitive skills,” he said. “It was a tough one to come back from. I was trying to edit the movie at the time and I couldn’t sit still.”
Knoxville has stated that Jackass Forever will be his final appearance in a Jackass film.
The movie is released in cinemas on 4 February.
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