email address!'); return false; } var emailRegExp = new RegExp("[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?"); if (!emailRegExp.test(email) || email.indexOf('.') == -1) { alert('The email address that you entered is invalid!'); return false; } return true; }

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Article citations

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Lang, P. J., Davis, M., & Ohman, A. (2000). Fear and Anxiety: Animal Models and Human Cognitive Psychophysiology. Journal of Affective Disorders, 61, 137-159.
http://dx.doi.org/10.1016/S0165-0327(00)00343-8

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