Conn. Practice Book § 40-18

If a defendant intends to introduce expert testimony relating to the affirmative defenses of mental

disease or defect, or of extreme emotional disturbance or another condition bearing upon the issue

of whether he or she had the mental state required

for the offense charged, the defendant shall, not later

than forty-five days after the first pretrial conference

in the court where the case will be tried or at such

later time as the judicial authority may direct, notify

the prosecuting authority in writing of such intention

and file a copy of such notice with the clerk. The

defendant shall also furnish the prosecuting authority

with copies of reports of physical or mental examinations of the defendant prepared by an expert whom

the defendant intends to call as a witness in connection with the offense charged, within five days after

receipt thereof. The judicial authority may for cause

shown allow late filing of the notice or grant additional

time to the parties to prepare for trial or make such

other order as may be appropriate.