As someone who has analyzed voices for three decades and has done forensic voice analysis, I was shocked when I heard the little girl like tone of Casey Anthony. Gone was the resonant deeper sounding more mature tone with bravado she had during the jailhouse tapes.
She sounded more like Caylee would sound than Casey. There may be several reasons for this. It may be a sign of fear as she is scared of her fate so so regressed into a little girl. She in essence began using a little girl higher pitched voice. Psychologically there may be a connection to using that voice tone as subconsciously trying to sound as sweet and innocent as Caylee.
It was obvious that her defense team made her look child like by lowering her seat and dressing her in bigger clothing throughout the trial. They were trying to let the jury know that they needed to go easy on this little diminutive creature. That was the subliminal message they were attempting to get across was that she was like a child.
Another reason for her child like voice and higher pitch may have a lot to do with the fact that she does not get much vocal usage. Therefore the muscles are weaker and are not worked out as much. I am sure that she is not speaking to too many people. If she is speaking to them it is for short increments of time.
When she said she will not testify she cocks her head which indicates that she is really not that sure but will go ahead with what her lawyers suggested anyway. Casey answered very politely with Yes Sir and No Sir. Gone is the arrogance and cockiness. It shows that she has been institutionalized well. She has been trained well to show some respect in her jail environment.
Too bad she didn’t have that respect for her parents and for Caylee. If she did none of this would have happened. http://www.drlillianglass.com