---
title: "Is AI Catching Up to Human Expression? — Alsadhan 2026"
description: "This study asks whether current large language models can reproduce human affective expression closely enough to pass as human."
authors: ["Nasser A Alsadhan"]
year: 2026
venue: "arXiv:2603.23251"
source: "https://arxiv.org/abs/2603.23251"
doi: "10.48550/arxiv.2603.23251"
arxiv: "2603.23251"
licence: "arXiv — non-exclusive license to distribute"
licence_url: "http://arxiv.org/licenses/nonexclusive-distrib/1.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/alsadhan-2026-ai-catching-up-human-expression/"
---
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# Is AI Catching Up to Human Expression? Exploring Emotion, Personality, Authorship, and Linguistic Style in English and Arabic with Six Large Language Models

**Authors:** [Nasser A Alsadhan](https://md.research.elamur.ai/free/en/authors/nasser-a-alsadhan/) · **Year:** 2026 · **Venue:** arXiv:2603.23251 · **Licence:** [arXiv — non-exclusive license to distribute](http://arxiv.org/licenses/nonexclusive-distrib/1.0/)

**Links:** [Publisher's page](https://arxiv.org/abs/2603.23251) · [PDF](https://arxiv.org/pdf/2603.23251) · [DOI 10.48550/arxiv.2603.23251](https://doi.org/10.48550/arxiv.2603.23251) · [arXiv 2603.23251](https://arxiv.org/abs/2603.23251) · [OpenAlex](https://openalex.org/W7140325460)

**Citations:** 0 citations (OpenAlex, 2026-10-14)

## Summary
This study asks whether current large language models can reproduce human affective expression closely enough to pass as human. It covers emotion in English and personality in Arabic, an under-resourced language. Six LLMs (Jais, Mistral, LLaMA, GPT-4o, Gemini, DeepSeek) were prompted to produce texts carrying target emotions or personality traits. Paraphrased versions of these outputs were also created.

Two experiments followed. First, classifiers were trained to separate human from machine authorship. Second, emotion and personality classifiers were trained and tested across human, AI and mixed data sources. Psycholinguistic profiling with LIWC and readability indices added an interpretable comparison.

Detection was very accurate (F1 above 0.95) but weakened considerably on paraphrased texts, which suggests the detectors depend on shallow stylistic cues. Classifiers transferred poorly between human and synthetic texts in both directions, so models seem to encode affect differently from people. Adding synthetic data helped only in the Arabic personality task. The work matters for AI-text detection, affective computing and low-resource data strategies.

## Key points
- Six models were compared: Jais, Mistral, LLaMA, GPT-4o, Gemini and DeepSeek, covering both multilingual and region-specific (Arabic-centric) systems.
- **Authorship detection:**
  - Human-vs-AI detection reached F1 > 0.95.
  - Removing punctuation hurt it only moderately.
  - Paraphrasing caused a much sharper drop, especially on AI-authored samples.
- **Cross-source generalization:** emotion and personality classifiers trained on human text did poorly on AI text, and the reverse also held. Mixing both sources gave modest gains for Arabic personality but no consistent gain for English emotion.
- **Model-level differences:**
  - In English, GPT-4o and Gemini were more human-aligned on some emotions (e.g., disgust), whereas LLaMA performed poorly on the majority of emotion categories.
  - For the Arabic data, Jais and Mistral showed comparatively stronger alignment with personality cues.
- **Linguistic profiles (English):**
  - LIWC was applied per sample and readability per corpus.
  - Human texts were more complex, with higher Gunning Fog and Dale-Chall scores, and differed in authenticity and emotional tone.
  - LLM texts were more readable and leaned analytic rather than narrative.
  - The Arabic dataset was small, and the data is available only on request.

## Interesting ideas
- Using paraphrased copies as a stress test shows whether a classifier relies on real signal or on surface form; a big drop exposes shortcut learning. — For Mova (learn): Add paraphrase-based negative controls to evaluation, checking that frames and answers stay stable when a sentence is reworded with the same meaning.
- Training on one source and testing on the other (human→AI and AI→human) cleanly measures the distribution gap between synthetic and natural text. — For Mova (learn): Score models trained on LLM-teacher silver data separately on human-written gold and on synthetic text, so teacher artifacts cannot inflate the metrics.
- Synthetic augmentation helped the low-resource setting but not the well-resourced one, so the benefit of generated data depends on context and should be tested rather than assumed. — For Mova (learn): Apply LLM-generated training material selectively to rare constructions or sparse verb classes, and measure gains against a baseline without augmentation.
- Ablating a single surface feature (here punctuation) measures how much a model leans on formatting cues. — For Mova (tree): Run the perceptron parser and gparse on punctuation-stripped input to quantify how much attachment decisions depend on commas and periods.
- Asking generators to choose diverse topics reduces the risk that a target label becomes confounded with subject matter. — For Mova (answer): When generating word problems or fable-QA test items, vary topics deliberately so readers cannot pass by exploiting topic-answer correlations.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

Fields: [Linguistics & languages](https://md.research.elamur.ai/free/en/shelves/linguistics/)

Topics: [Language models & pretraining](https://md.research.elamur.ai/free/en/topics/language-models/) · [Sentiment & emotion](https://md.research.elamur.ai/free/en/topics/sentiment-emotion/) · [Semitic languages](https://md.research.elamur.ai/free/en/topics/semitic-languages/)

## Institutions

- [King Saud University](https://md.research.elamur.ai/free/en/universities/king-saud-university/) — University, Riyadh, Saudi Arabia · 13 works · 290 citations

## Cite

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@misc{alsadhan2026is,
  title = {{Is AI Catching Up to Human Expression? Exploring Emotion, Personality, Authorship, and Linguistic Style in English and Arabic with Six Large Language Models}},
  author = {Alsadhan, Nasser A},
  year = {2026},
  doi = {10.48550/arxiv.2603.23251},
  eprint = {2603.23251},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2603.23251}
}
```

- [← previous IQRA 2026: Interspeech Challenge on Automatic Pronunciation Assessment for Modern Standard Arabic (MSA)](https://md.research.elamur.ai/free/en/papers/kheir-2026-iqra-2026-interspeech-challenge-automatic/)
- [next → Is Biomedical Specialization Still Worth It? Insights from Domain-Adaptive Language Modelling with a New French Health Corpus](https://md.research.elamur.ai/free/en/papers/mannion-2026-is-biomedical-specialization-still-worth/)
- [↑ back to papers of 2026](https://md.research.elamur.ai/free/en/papers/2026/page/7/)

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