Q : Is this principle widely used in America, Japan, Korea?

Other key elements of voice that affect learning

Professor Clifford Nass and Scott Brave Wired for Speech: How Voice Activates and Advances the Human-Computer Relationship

1. Human VS. Machine Voice

Professor Clifford Nass predicts that two or three years later, people would hardly distinguish between human and machine voices.

In addition, humans can imitate machine voice as well.

http://www.youtube.com/watch?v=J037NhHtB6U

2. Male VS. Female Voice

Men trust male voice ; Women trust female voice

My observation: Women will use female -voice GPS and Men will use either male or female –voice GPS

3. Happy VS. Sad Voice

Happy Drivers like happy voices and have less accidents while listening to happy- voice GPS

Sad drivers like sad voices and will have less accidents while listening to sad - voice GPS

http://www.stanford.edu/dept/lc/efs/2007/2007FHSLecture2streaming.html

Conclusion

1. human voice 2. native speaker 3. gender 4. emotion