which actress contributed to developing the voice of e.t. the extra-terrestria
Pat Welsh
E.T. the Extra-Terrestrial
The major voice work of E.T. for the film was performed by Pat Welsh. She smoked two packs of cigarettes a day, which gave her voice a quality that sound effects 
wiki:13389013
E.T. the Extra-Terrestrial [SEP] Casting
Spielberg felt Drew Barrymore had the right imagination for mischievous Gertie after she impressed him with a story that she led a punk rock band. He enjoyed working with the children, and he later said that the experience made him feel ready to be a father. The major voice work of E.T. for the film was performed by Pat Welsh. She smoked two packs of cigarettes a day, which gave her voice a quality that sound effects creator Ben Burtt liked. She spent nine-and-a-half hours recording her part, and was paid $380 by Burtt for her services. He also recorded 16 other people and various animals to create E.T.'s "voice".