A Developmental-Maladaptive Bifurcation Model Based on Depth of Processing in HSP/SPS, Version 2.1: Reconsidering Developmental Conditions through the Distinction between Sensitivity and Reason-Based Thinking

(v2.1 adds Section 3.1, which clarifies that an acute distress phase may occur between disintegration and reconstruction, and that this phase should not be regarded as developmental failure.) This paper takes Aron's concept of Depth of Processing in HSP/SPS as its starting point and proposes a rationale for separating two variables — Sensitivity and Reason-Based Thinking — that determine the bifurcation between developmental and maladaptive pathways. The central proposition is: Sensitivity is the condition for disintegration, and Reason-Based Thinking is the condition for reconstruction. The paper further organizes connections with Dabrowski's Theory of Positive Disintegration and Kegan's adult developmental theory through orthogonal decomposition of the three theories. Positioned as a companion paper to the Mental-4-Element Framework v1.5. All propositions are hypothetical and require empirical verification. Developed with AI assistance.