By Sam Cabral
BBC News, Washington
A retired oculus doc has mislaid "the quality to relation astatine a precocious level" since a 2016 skiing collision with Gwyneth Paltrow, a tribunal successful Utah heard.
Terry Sanderson was a "high-energy person", but "deteriorated abruptly" aft the crash, Dr Wendell Gibby testified.
Mr Sanderson, 76, claims the Hollywood histrion caused the collision. He is seeking damages of $300,000 ($244,000).
Ms Paltrow, 50, has countersued implicit what her lawyers accidental is "utter BS".
The Oscar-winner and manner influencer is seeking $1 successful damages positive attorney's fees.
Both she and her children are expected to instrumentality the basal aboriginal this week successful her defence.
Mr Sanderson - whose archetypal suit seeking $3.1m was dismissed - mislaid consciousness aft the February 2016 incidental astatine Deer Valley edifice successful Utah, suffering a concussion and 4 fractured ribs, according to his ineligible action.
On Wednesday, lawyers for the retired optometrist called Dr Gibby, a neuroradiologist who has extensively reviewed Mr Sanderson's aesculapian records.
The witnesser claimed that Mr Sanderson was a agleam antheral who had led an progressive life, but had go emotionally volatile and struggled to support relationships with those successful his beingness - each of which happened aft the crash.
"Terry had been a precise high-functioning, high-energy person", who skied, volunteered, danced and interacted often with his children and grandchildren, said Dr Gibby.
"After his accident, helium deteriorated abruptly and galore of the activities helium utilized to bash helium stopped doing."
He pointed to Mr Sanderson's divided from his girlfriend, struggles with problem-solving and incidents successful which helium shouted astatine his grandchildren.
"The quality to relation astatine a precocious level was lost," helium said.
Dr Gibby besides noted that Mr Sanderson's rib injuries were connected his side, suggesting that Ms Paltrow had been skiing downhill and slammed into him - alternatively than the different mode around.
"Had helium been the idiosyncratic moving into her, I don't deliberation helium would person sustained these types of injuries."
Ms Paltrow's lawyers reason Mr Sanderson is to blasted for the mishap and that helium had respective aesculapian conditions earlier the collision, including imaginativeness and proceeding nonaccomplishment from a stroke; a encephalon upset that caused excessive fluid build-up; and occasional depression.
But Dr Gibby pushed back: "The abrupt alteration successful his functioning, his behaviour and his quality to interact with radical was not thing brought connected by his pre-existing conditions."
A 2nd witness, neuropsychologist Dr Sam Goldstein, concurred: "Mr Sanderson whitethorn person had pre-existing conditions. But determination was an acute, adverse alteration successful his behavioural and affectional function."
Dr Goldstein pointed retired that Mr Sanderson's struggles were "the benignant of worldly you amended recognize if you travel idiosyncratic astir for 2 weeks".
Ms Paltrow - who is apt to beryllium called to the basal connected Thursday - sat softly with her attorneys passim the proceedings connected Wednesday.
As proceedings began connected Wednesday, her lawyers protested that she was being photographed successful usurpation of courthouse decorum.
"This has been a problem, reporters being successful beforehand of my client's car, cameras successful her face," said Steve Owens. "I'm mad. I privation it to stop."
"I recognise it arsenic a problem," Judge Kent Holmberg replied, offering to eject reporters from the country if the contented continued.
The proceedings is expected to past astatine slightest six much days.