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The following five sentences, labeled 1 to 5, relate to a single topic. Four of these sentences can be arranged to form a logical paragraph. Identify the sentence that does not fit with the others and enter its number as your answer.

1. The "hard problem" of consciousness, as articulated by philosopher David Chalmers, primarily concerns the perplexing question of why and how physical brain processes give rise to subjective, qualitative experiences, often referred to as qualia.
2. This specific philosophical challenge is crucially distinct from the "easy problems" of consciousness, which pertain to explaining cognitive functions such as information discrimination, attention, memory, and verbal reportability in mechanistic terms.
3. Identifying the neural correlates of consciousness (NCCs), while vital for empirical neuroscience, primarily elucidates *which* physical states correlate with conscious experience, not *how* or *why* these physical states generate subjective awareness itself.
4. Some contemporary theories, such as integrated information theory (IIT), propose a mathematical framework to quantify consciousness based on the intrinsic cause-effect power of a system, suggesting a path towards its scientific measurement.
5. Consequently, the persistent explanatory gap between physical events and phenomenal experience continues to highlight the inherent limitations of purely physicalist or functionalist accounts in fully addressing subjective phenomena.

Correct Answer: 4
Identification of the Theme: The core argument discusses the definition, distinct nature, and inherent intractability of the 'hard problem' of consciousness for purely physicalist explanations.
Logical Sequence of the Coherent Paragraph: 1-2-3-5.
Sentence 1: Introduces and defines the "hard problem" of consciousness, including its core components.
Sentence 2: Differentiates the "hard problem" from the "easy problems," clarifying the distinct scope of the primary philosophical challenge.
Sentence 3: Explains why empirical findings like neural correlates of consciousness (NCCs) address the "easy problems" but do not resolve the more fundamental "hard problem."
Sentence 5: Concludes by emphasizing the persistent "explanatory gap" and the limitations of current physicalist and functionalist approaches in fully addressing the hard problem.
Why Sentence 4 is the Odd One Out: While Sentence 4 is broadly related to consciousness, it introduces a specific theoretical framework (Integrated Information Theory, IIT) that offers a particular scientific and philosophical approach to *explaining or quantifying consciousness itself*. The coherent set of sentences (1, 2, 3, 5), however, focuses on *defining the "hard problem," distinguishing it from "easy problems," and highlighting its inherent resistance and the explanatory gap it poses for physicalist accounts*. Thus, Sentence 4 shifts the focus from characterizing the *nature and difficulty of the problem* to presenting a *specific theoretical solution or framework for understanding consciousness*, thereby discussing a different aspect of the broad topic.