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1. To participate in this survey you must be a native American English speaker located in the U.S. The survey will take around 30 minutes to complete.

You will be listening to 30 sets of audio samples. In each set, there are 5 audio recordings of the same text. Some of them may be synthesized while others may be spoken by an American audiobook narrator. Please listen to the audio clips carefully, then,

Rate how natural each audio clip sounds on a scale of 1 to 5 with 1 indicating completely unnatural speech (bad) and 5 completely natural speech (excellent). Here, naturalness includes whether you feel the speech is spoken by a native American English speaker from a human source. Some clips may be cut early, please ignore words that may be cut off when rating the naturalness.

There are some audios for checking your attention through the survey. If a certain number of the scores are rated unreasonably, you will not be paid. So, listen to the audios carefully and do not fill out the survey randomly. *This question is required.

I have read the above purpose of the study, and understand my role in participating in the research. I volunteer to take part in this research. I understand that I may refuse to participate or withdraw from participation at any time. The investigator may withdraw me at his/her professional discretion. I certify that I am 18 years of age or older and a native english speaker and freely give my consent to participate in this study.

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