The four sentences (labelled 1, 2, 3, 4) below, when properly sequenced would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and key in the sequence of the four numbers as your answer:

1. While you might think that you see or are aware of all the changes that happen in your immediate environment, there is simply too much information for your brain to fully process everything.
2. Psychologists use the term ‘change blindness’ to describe this tendency of people to be blind to changes though they are in the immediate environment.
3. It cannot be aware of every single thing that happens in the world around you.
4. Sometimes big shifts happen in front of your eyes and you are not at all aware of these changes.

The correct answer is 1342.

To understand why the sequence 1 → 3 → 4 → 2 creates a coherent paragraph, let us examine the logical and thematic flow between each sentence.

Step 1 — Starting with Sentence 1:
Sentence 1 reads: "While you might think that you see or are aware of all the changes that happen in your immediate environment, there is simply too much information for your brain to fully process everything."

This is the ideal opening sentence because it introduces the core idea: our brain is overwhelmed by the sheer volume of information in the environment. It directly addresses the reader ("you might think"), creating engagement, and sets up a contrast between what we think we perceive and what we actually process. This contrast is the foundation of the entire paragraph.

Step 2 — Following with Sentence 3:
Sentence 3 reads: "It cannot be aware of every single thing that happens in the world around you."

Notice that Sentence 3 begins with the pronoun "It" — a clear anaphoric reference. The word "It" refers directly back to "your brain", which was the last major subject introduced at the end of Sentence 1. This grammatical linkage makes Sentence 3 a seamless continuation. It reinforces and deepens the point made in Sentence 1: not only is there too much information, but the brain is structurally incapable of registering everything. Sentence 3 cannot come first, because "It" would have no referent.

Step 3 — Continuing with Sentence 4:
Sentence 4 reads: "Sometimes big shifts happen in front of your eyes and you are not at all aware of these changes."

Having established in Sentences 1 and 3 that the brain cannot process all information, Sentence 4 now gives us a concrete consequence of this limitation: even major, significant changes happening right in front of us can go completely unnoticed. The phrase "in front of your eyes" makes the point vivid and surprising — these are not subtle background changes, but big shifts. This sentence effectively bridges the theoretical groundwork (Sentences 1 and 3) with the named concept about to be introduced in Sentence 2.

Step 4 — Concluding with Sentence 2:
Sentence 2 reads: "Psychologists use the term 'change blindness' to describe this tendency of people to be blind to changes though they are in the immediate environment."

This is the natural concluding sentence because it introduces the formal, technical term — 'change blindness' — as a label for everything that has been described in the preceding three sentences. The phrase "this tendency" is a direct backward reference to the behavior illustrated in Sentences 1, 3, and 4. In academic and explanatory writing, it is standard practice to first describe a phenomenon in plain language and then assign it its technical name. Placing Sentence 2 at the end gives the paragraph a satisfying, well-structured conclusion.

Summary of the Logical Flow:
The paragraph progresses in a clear, logical arc:

   Sentence 1 → Introduces the general problem: the brain cannot process all environmental information.
   Sentence 3 → Reinforces and narrows this point: the brain simply cannot be aware of everything.
   Sentence 4 → Provides a dramatic example: even large, obvious changes in front of our eyes can go unnoticed.
   Sentence 2 → Gives the scientific name for this phenomenon: change blindness.

Thus, the correct sequence is 1 �� 3 → 4 → 2, i.e., 1342.