This experiment takes only a few minutes to complete. Your contribution is very valuable to us, and will help us understand more about the psychology of decision making.
DESCRIPTION: You are invited to participate in a research study that investigates how humans make judgments on attributes such as attractiveness.
You will see pairs of pictures, and your job is to say which one of the pair you consider most attractive. For example, a pair could be like this:
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The pictures have been taken from the popular site HotOrNot, where people rate others from 1 to 10 in attractiveness. In this case, you will see picture pairs and will get to click on one of them, instead of using a rating scale.
Some picture pairs will appear more than once, either in the same screen position (left/right) or in a different one. That is normal. Just click on the picture of the person you consider more attractive. Work quickly without thinking too much. It is important to us that you finish the entire experiment, so do not get discouraged if you think there are still many pictures to evaluate.
Please do not press the 'Back' button nor the 'reload' button on your browser at any point during the experiment.
RISKS AND BENEFITS: There are no known risks involved in this procedure. Beyond the satisfaction and enjoyment of participating in a scientific experiment, there are no benefits to participation.
TIME INVOLVEMENT: Your participation will take approximately 4 minutes. A total of 60 pairs of pictures will be presented.
SUBJECT'S RIGHTS: If you have read this form and have decided to participate in this experiment, please understand your participation is voluntary and you have the right to withdraw your consent or discontinue participation at any time without penalty, simply by closing your web browser. Your individual privacy will be maintained in all published and written data resulting from the study. All results will be treated confidentially and kept anonymous.
If you agree with the above-stated conditions and are willing to participate, please give your consent by clicking on the start button that will appear after the red bar gets completely filled, which will also start the experiment. By clicking on the button, you confirm that you meet the following conditions:
You are at least 18 years old.
You have read the above consent form, understand it and you agree to it.
You want to participate in the above-mentioned experiment.
If you have any queries before taking part, please feel free to contact me at 
for more details.
If you have already taken part in this experiment, please do not do so again.
HotOrNot content and trademark belongs to Eight Days, Inc.
Thanks for your collaboration.