Salah Abdeslam's lawyer, Frank Berton, said the judge repeatedly asked questions to no avail today.
Berton said Abdeslam was not obligated to explain his silence but "obviously" it's linked to the constant surveillance.
Authorities hope Abdeslam can provide information about the Islamic State group's strategies and networks, and identify others who might have had a connection to the Nov 13 attacks, which killed 130 people.
The same network that attacked Paris struck again in Abdeslam's hometown of Brussels in March, days after he was tracked down in his hideout and arrested.
Abdeslam kept silent at a hearing in May, and refused to attend a hearing in July. Berton argued that two round-the- clock video cameras in Abdeslam's cell in Fleury-Merogis prison could cause psychological damage, but France's top administrative authority struck down the lawyer's request to remove them.
Judicial authorities argue the surveillance is needed to ensure he doesn't commit suicide.
Abdeslam, 26, initially said he wanted to explain his path to radicalization and his role in the Nov 13 attacks on the Bataclan concert hall, cafes and the national stadium.
Abdeslam's precise role in the attacks has never been clear. The Paris prosecutor has said he was equipped as a suicide bomber that night, but abandoned his plans and fled. Abdeslam evaded police for four months, but was arrested in March in the Brussels neighborhood where he grew up. He was later extradited to France and handed several preliminary terrorism charges.
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