Meaning: 'The' is used to refer to a specific item or concept that is already known or has been previously mentioned.

Wrong options:

• a: 'A' is an indefinite article that refers to any single item, which does not specify the norm being discussed here.
• than: 'Than' is a conjunction used for comparisons, which does not fit grammatically in this context as it does not serve as an article.
• due: 'Due' is an adjective that indicates something is owed or expected, which does not fit in the context of specifying a noun.
• after: 'After' is a preposition indicating time or sequence, which does not fit as it does not serve as an article.
• own: 'Own' is an adjective that indicates possession, which does not fit as it does not serve as an article.
• into: 'Into' is a preposition indicating movement or direction, which does not fit as it does not serve as an article.
• light: 'Light' is a noun that does not fit grammatically or contextually as it does not serve as an article.

Correct answer: due

Explanation: The word 'due' functions as an adjective indicating that something is caused by or attributable to something else. In this context, it fits grammatically and contextually as it explains the reason for the occurrence of the sensation.

Meaning: 'Due' means caused by or resulting from something.

Wrong options:

• a: 'A' is an indefinite article that does not fit as it does not convey causation or reason in this context.
• than: 'Than' is a conjunction used for comparisons, which does not fit as it does not indicate a cause.
• after: 'After' is a preposition indicating time or sequence, which does not fit as it does not convey causation.
• own: 'Own' is an adjective indicating possession, which does not fit as it does not convey a reason or cause.
• into: 'Into' is a preposition indicating movement or direction, which does not fit as it does not convey causation.
• light: 'Light' is a noun that does not fit grammatically or contextually as it does not convey a reason.

Correct answer: own

Explanation: The word 'own' is an adjective that indicates possession, referring to the hypothesis belonging to the speaker. It fits grammatically as it describes whose hypothesis is being reinforced.

Meaning: 'Own' means belonging to oneself; it indicates possession.

Wrong options:

• a: 'A' is an indefinite article that does not fit as it does not indicate possession or ownership.
• than: 'Than' is a conjunction used for comparisons, which does not fit as it does not indicate possession.
• due: 'Due' is an adjective indicating causation, which does not fit as it does not convey ownership.
• into: 'Into' is a preposition indicating movement or direction, which does not fit as it does not convey possession.
• light: 'Light' is a noun that does not fit grammatically or contextually as it does not convey ownership.

Correct answer: into

Explanation: The word 'into' is a preposition that indicates movement toward the inside of something. In this context, it fits grammatically as it describes how information is consolidated within memory.

Meaning: 'Into' indicates movement or transformation from one state to another, in this case, information becoming part of memory.

Wrong options:

• a: 'A' is an indefinite article that does not fit as it does not indicate movement or transformation.
• than: 'Than' is a conjunction used for comparisons, which does not fit as it does not indicate movement.
• due: 'Due' is an adjective indicating causation, which does not fit as it does not convey movement or transformation.
• own: 'Own' is an adjective indicating possession, which does not fit as it does not convey movement.
• light: 'Light' is a noun that does not fit grammatically or contextually as it does not convey movement.

Correct answer: longer

Explanation: The word 'longer' is a comparative adjective that indicates an extension of time or duration. It fits grammatically as it describes a change in the brain's perception of the need to focus.

Meaning: 'Longer' means for a greater duration of time; it indicates that the need to focus has diminished over time.

Wrong options:

• a: 'A' is an indefinite article that does not fit as it does not convey a change in duration or time.
• than: 'Than' is a conjunction used for comparisons, which does not fit as it does not indicate duration.
• due: 'Due' is an adjective indicating causation, which does not fit as it does not convey a change in duration.
• own: 'Own' is an adjective indicating possession, which does not fit as it does not convey duration.
• into: 'Into' is a preposition indicating movement or direction, which does not fit as it does not convey duration.
• light: 'Light' is a noun that does not fit grammatically or contextually as it does not convey duration.