Janis has volunteered to participate in a psychology experiment. when she arrives, a lab assistant standing on the other side of a counter greets her. he explains the informed consent procedure and asks her to sign a form. as the lab assistant reaches for the form he drops it behind the counter. he drops down behind the counter to pick it up, but another person stands up holding the form. after janis signs it, she is asked if she noticed the change. she replies that she did not. this phenomenon is known as:

The phenomenon is known specifically as the change blindness. This is a phenomenon where in the observer has fail to notice the differences that has been laid out to him or her when a certain visual stimulus is triggered or the observer is exposed to.

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abu bakr, was a senior companion and—through his daughter aisha—a father-in-law of the islamic prophet muhammad. abu bakr became the first openly declared muslim outside muhammad's family. abu bakr served as a trusted advisor to muhammad.