Some research says customers usually cannot tell when they are being served by a voice-enabled computer with artificial intelligence.

FORBES: It's Not the Stupid Worker...

Obviously we have a long ways to go before either Siri or Cluzee or any other voice app can actually be deemed an artificial intelligence.

FORBES: When Cluzee Met Siri

Siri, a voice-controlled virtual personal assistant that relies on artificial intelligence, is the most advertised feature of the new iPhone 4S from Apple (AAPL).

FORBES: Google Gets Alfred But It's Certainly No Siri