HOUSTON (AP) — Videotaped interviews with Andrea Yates show her emerging from psychosis in the months after she drowned her children in their bathtub, a psychiatrist testified.

In a tape played in court before the defense rested Wednesday, a disheveled Yates was asked to recall her thoughts and emotions the day of the drowning. Yates cried, rocked in her chair, paused and eventually said: "I don't remember."

In a second tape made last month, Yates looks well-groomed and bright-eyed. "I'm a little more aware of what's going on," she can be heard saying.

The stark difference from the first tape, made five weeks after the drownings, is due to the treatment Yates is receiving, said Dr. Lucy Puryear, who testified Yates was so sick June 20, the day she drowned her children, that she was incapable of determining her actions were wrong.

"It's not like she could come up with a list of options," Puryear said. "She was psychotic at the time and driven by delusions that they were going to hell and she must save them."

In the second tape, Yates discussed with the psychiatrist how she tried to block thoughts of harming 7-year-old Noah, her oldest child. She also talked about feeling overwhelmed when her growing family was living inside a converted bus in the late 1990s and how she attempted suicide in 1999, hoping it would prevent her from harming her children.

Yates, 37, has pleaded innocent by reason of insanity to capital murder charges for drowning Noah, 5-year-old John and 6-month-old Mary at their Houston home. Charges could be filed later in the deaths of Paul, 3, and Luke, 2.

Prosecutor Joe Owmby questioned Puryear about differences in her testimony and that of another defense expert, Dr. Phillip Resnick, who last week testified that Yates knew drowning her children was illegal but thought it was the right decision to keep her children from eternal damnation.

Puryear told Owmby that she and Resnick just have differing opinions.

The prosecution can begin calling rebuttal witnesses Thursday in Yates' capital murder trial.

If jurors convict her of capital murder, Yates faces life in prison or the death penalty. If she is found innocent by reason of insanity, the court will have to determine whether to commit her or set her free.

Defense witnesses have contended that Yates delusionally believed by killing her children she would save them from hell and eliminate Satan from the world when she was executed by the state of Texas.

Puryear told jurors that Yates suffers from a psychotic disorder, most likely schizophrenia, and major depression that worsens in the postpartum period.

"She was pretty consistently pregnant and/or breast-feeding with few breaks in between," said Puryear, an expert on reproductive-related psychiatric disorders.

Puryear said being taken off an anti-psychotic drug just two weeks before the children were drowned caused Yates to become "overwhelmingly psychotic."