The sickness must have erased a portion of her memory.

I opened to him a certain portion of my memory, stepped aside.

What other portions of your memory have been affected?

He's recovered a large portion of his memory but certainly not all of it.

Individuals with schizophrenia may demonstrate amnesia for portions of their episodic memory.

Had it been implanted in an inaccessible portion of his memory, somehow now released?

And there was one particular portion of his memory that he simply could not touch.

That portion of his memory had not been passed along.

I have had many experiences, including an accident which has unfortunately obscured portions of my memory.

If only he had retained this portion of his memory!