Answer: Inattentional blindness
Explanation: When an individual fails to notice or perceive an object or stimulus which is in his line of sight, without any obstruction or hindrance between the person and the object and the individual has no visual defect or impairment. The individual's inability to perceive or notice such stimulus or object is called Inattentional or perceptual blindness. Inattentional blindness usually results from an individual's failure to pay attention to a stimulus or object, This could be caused when the individual focus so much on a certain stimulus such that he fails to notice other stimulus or objects within his visual range.