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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 30-40 minutes to complete.

You will be listening to 20 sets of audio samples. In each set, there is one reference voice for every 5 audio clips. The 5 audio recordings have the same text, and some of them may be synthesized while others may be spoken by native speakers. Please listen to the audio clips carefully, then,

A) 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 English speaker from a human source.

B) Please compare each audio clip with the reference, Rate whether the two audio clips could have been produced by the same speaker or not on a scale of 1 to 5 with 1 indicating completely different speakers and 5 indicating exactly the same speaker. Some samples may sound somewhat degraded/distorted. Since a person may also speak in varying tones and speed, for this question, please try to listen beyond the distortion, speed, and tone of the speech, and concentrate on identifying the voice (including the person's accent if possible).

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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