According to these scientists, some people fail to notice an object that appears unexpectedly right in the path of their vision because they are already engrossed or paying attention to another task, object or event.

Many people believe that seeing an object means that eyes are open and vice versa. The same was the opinion that many cognitive scientists had. According to them, visual perception or seeing objects through the eye is similar to that of a videotape recorder where the brain records the information that is taken by the eye. However, recent studies conducted during the last two decades have revealed that people actually see very little when they are not paying any attention.

There are different reasons cited by scientists in order to explain inattentional blindness. One of them is conspicuity that may be either sensory or cognitive. It is important that the object must be conspicuous so as to get noticed and gain attention. If the object is not conspicuous, it is not noticed by the mind even though it is perceived by the eye. Another reason for inattentional blindness is the mental workload and task interference. The more things a person attends to, the more are the chances of experiencing inattentional blindness. Even the observer’s expectations can have an effect on intentional blindness as well. Inattentional blindness can occur when the person is having too little mental load such as situations where people are performing routine tasks such as driving.

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