Hi
This could be a very late response.  But I have some inputs to be shared here in this forum, so that it can be useful for other Mom to be moms...
What does "Prenatal Stimulation" means? - The answer is "Stimulating your child right from your womb".
Right from the day one of your pregnancy, you can start talking your kid (dont juz think it has not fully grown).  Start embrace your kid by rubbing your hands on your precious belly and provide a sooth and soft touch often to your babe in the womb.  She will start feeling it and the feel will increase as days go on..
Your baby can hear your talking and at times you can receive her response during your 7, 8 and 9th months..
Always be happy - one important thing during your pregnancy
Listen to a lot of soft and lovely music.
Do meditate early in the morning and during bed times.
Always have positive thinking - very very important.
And think of what kind of characters your kid should have - start talking those stuffs to your kid from 6th month owards.
eg: "Hi bebo, I love you so much.   You should always have a cute smile on your face".  kind of soothing talks.
Prepare a list of items like this and read out louder so that your cuty can listen in your womb.
Do alpha meditation.

A very gr8 Hiiiii for all..
I am Uma - a wonderful mom.  I do have a great kid of 1 year old named 'Sujay' means victory.  I am having lovely Motherhood period and am enjoying teaching him and I do have double enjoyment when I receive great responses from my kid. 
I do like to receive all the inputs from brill kids also very well interested to share my experiences too to all Moms...

Cheers
Uma.