The is the difficulty in perceiving and responding to the second of two target stimuli amid a rapid stream of stimuli if the observer has responded to the first target stimulus within 200 to 500 ms before the second stimulus is presented.

Attentional Blink.

Explanation:

So, let us first fill in the gap in the question above. Please note that the capitalized words are the missing words in the question.

" The ATTENTIONAL BLINK is the difficulty in perceiving and responding to the second of two target stimuli amid a rapid stream of stimuli if the observer has responded to the first target stimulus within 200 to 500 ms before the second stimulus is presented".

So, let me try to explain what attentional blink means with the simplest example I know, okay, there are some circumstances or times that when you shift your gaze from one objet to another or second object there is going to time between that shift that you will have to blink. This concept is known as ATTENTIONAL BLINK.

Attentional Blink occurs when there is a mistake in reporting the second object.

the following men who did not in the unification of italy were.

a) giuseppe mazzini

c) alexander ll

the other two men were camilo cavour and giuseppe garibaldi they the unification of italy by yielding territories in the italian unification. in 1861 italy was declared a united-nation state under the sardinian king victor immanuel ll.