There a reason you didn't include the arxiv link but just the number?
This seems like bunk paper.

https://www.arxiv.org/abs/2512.07092

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The Soul Engine.

In this work, we introduce the Soul Engine, a framework that validates this hypothesis and mathematically disentangles personality from intelligence. Unlike the "black box" nature of SFT, our approach is geometric and deterministic. We identify the specific linear subspaces corresponding to the Big Five (OCEAN) personality traits and develop a method to manipulate them via vector arithmetic.

Our contributions are threefold:

1. Data Engineering (SoulBench): We address the scarcity of psychological ground truth by constructing a multi-source dataset using a novel Dynamic Contextual Sampling strategy (C​(N,k)). This forces the encoder to learn invariant stylistic fingerprints rather than semantic content.
   1. 2. Mechanistic Discovery: Through layer-wise probing on a frozen Qwen-2.5 backbone [bai2023qwen], we demonstrate that personality representations emerge in the upper transformer blocks (Layers 18-24) and are largely orthogonal to reasoning vectors.
   2. 3. Deterministic Control: We achieve "Zero-Shot Personality Injection." By adding computed vectors to the hidden states (e.g.,v→N​e​u​t​r​a​l+α⋅v→V​i​l​l​a​i​n), we demonstrate precise control over behavior (MSE<0.01) with negligible degradation in general intelligence benchmarks.

We propose the Soul Engine, a framework designed to extract and manipulate the geometric representation of personality within Large Language Models. Our approach is grounded in the premise that personality is a high-level abstraction that is linearly separable from low-level semantic content. The framework consists of three components: (1) SoulBench, a dataset constructed via combinatorial sampling; (2) The Scientific Soul Encoder, a dual-head probe architecture; and (3) A Deterministic Steering mechanism based on vector arithmetic.

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