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This system description presents a Wixarika image captioning system for the AmericasNLP 2026 Shared Task on Cultural Image Captioning for Indigenous Languages. The system uses Spanish as a pivot language, combining CLIP-based image retrieval, Qwen3-VL Spanish caption generation, the official Sheffield-compatible Spanish-to-Wixarika MT model, and character n-gram language-model reranking. We report local 5-fold development results, official test results, error analysis, and implementation details for reproducibility.

ACL 2026

6fanle Submission to the AmericasNLP 2026 Shared Task on Wixarika Image Captioning

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The 64th Annual Meeting of the Association for Computational Linguistics (ACL 2026) will take place in San Diego, California, from July 2 - 7, 2026.

workshop paper

Culturally grounded image captioning for under-resourced Indigenous languages is challenging due to severe data scarcity and the need to describe culturally specific visual content. This paper describes our submission to the AmericasNLP 2026 shared task, where we evaluate two architectural paradigms for caption generation across Bribri, Guaraní, Yucatec Maya, Wixárika, and Orizaba Nahuatl. First, we implement a cascaded system that combines a large vision-language model with a machine translation pipeline, showing that culturally contextualized, persona-based prompting improves over the official baseline in most comparable settings. Second, we develop a direct, end-to-end Single-stage approach by adapting PaliGemma 2 using LoRA fine-tuning, continued pre-training, and multilingual joint training. Our single-stage experiments show that, despite severe domain mismatch and reliance on synthetic training data, multilingual training and continued pre-training improve automatic chrF++ relative to single-language LoRA fine-tuning in some settings. Overall, cascaded pipelines remain the strongest among the evaluated approaches under current data constraints, while single-stage models remain a promising but currently data-limited path toward direct Indigenous-language image captioning.

Culturally Grounded Image Captioning in Indigenous Languages with Vision-Language Models: Cascaded and Single-Stage Approaches

We describe the USP system for the AmericasNLP 2026 Shared Task on Culturally Relevant Image Captioning for Indigenous Languages, covering Guaraní (grn), Maya Yucateco (yua), Nahuatl (nah), Wixárika (hch), and Bribri (bzd). We propose a two-stage cascade: Qwen3-VL-8B-Instruct (Bai et al., 2025) generates Spanish captions via language-specific cultural prompts; language-specific fine-tuned NLLB-200-distilled-600M (NLLB Team et al., 2022) models then translate them into each target language. We train on AmericasNLP 2023 data (Ebrahimi et al., 2023) augmented with public parallel corpora. Our system achieves competitive results, including 3rd place in Guaraní human evaluation (2.41/5.0) and 5th in Bribri (1.09/5.0) among 8 teams. We also report that NLLB-200-distilled-600M silently lacks vocabulary entries for Bribri and Maya Yucateco, producing English output without error.

USP at AmericasNLP 2026 Shared Task: Culturally-Aware Image Captioning for Indigenous Languages via Vision-Language Models and Fine-Tuned Neural Machine Translation

Multilingual large language models (LLMs) are increasingly used to interpret mental health narratives in settings such as support chatbots, screening, and content moderation. A basic reliability question remains underexplored: when the same narrative is presented in different languages, does a model apply comparable evaluative standards? We study cross-linguistic variation in mental health evaluation between English and Chinese using two widely deployed LLMs (GPT-4o and Qwen3-32B). We separate (i) construct-level evaluative orientation from (ii) decision-level behavior on downstream tasks. At the construct level, we adapt validated psychometric stigma instruments spanning social, self, and health-professional stigma and quantify language-conditioned shifts in model responses. At the decision level, we evaluate models on binary stigma detection and four-way depression severity classification using semantically aligned English--Chinese datasets. Across instruments and models, Chinese prompts elicit systematically higher stigma scores than English prompts. These differences propagate to downstream decisions: Chinese prompts reduce sensitivity in stigma detection and induce a downward shift in predicted depression severity, producing substantially more under-estimation errors. Our findings show that prompt language can shift both evaluative orientation and effective decision thresholds, underscoring the need for multilingual evaluation and calibration before deploying LLMs in socially sensitive domains.

Language Shapes Mental Health Evaluations in Large Language Models

The evaluation of societal biases in NLP models is critically hindered by a geo-cultural gap. This leaves regions such as Latin America severely underserved, making it impossible to adequately assess or mitigate the perpetuation of harmful regional stereotypes in language technologies.

This paper presents LACES, a stereotype association dataset, for 15 Latin American countries. This dataset includes 4,789 stereotype associations\footnote{The de-identified dataset can be accessed via \href{https://github.com/fvialibre/LACES}{GitHub}}, manually created and annotated by 83 participants. The dataset was developed through targeted community partnerships across Latin America.

Additionally, in this paper, we propose a novel adaptive data collection methodology that uniquely integrates the sourcing of new stereotype entries and the validation of existing data within a single, unified workflow. This approach results in a resource with more unique stereotypes than previous static collection methods, enabling a more efficient stereotype collection. The paper further supports the quality of LACES by demonstrating reduced efficacy of debiasing methods on this dataset in comparison to existing popular stereotype benchmarks.

Adaptive Data Collection for Latin-American Community-sourced Evaluation of Stereotypes (LACES)

Stereotype repositories are critical to assess generative AI model safety, but currently lack adequate global coverage. It is imperative to prioritize targeted expansion, strategically addressing existing deficits, over merely increasing data volume. This work introduces a multilingual stereotype resource covering four sub-Saharan African countries that are severely underrepresented in NLP resources: Ghana, Kenya, Nigeria, and South Africa. By utilizing socioculturally-situated, community-engaged methods, including telephonic surveys moderated in native languages, we establish a reproducible methodology that is sensitive to the region's complex linguistic diversity and traditional orality. By deliberately balancing the sample across diverse ethnic and demographic backgrounds, we ensure broad coverage, resulting in a dataset of 3,534 stereotypes in English and 3,206 stereotypes across 15 native languages.

SAFARI: A Community-Engaged Approach and Dataset of Stereotype Resources in the Sub-Saharan African Context

Large language models (LLMs) are increasingly used as evaluative tools across languages, yet bias research remains overwhelmingly Anglocentric, with most studies conducted in English using Latin-script names. It remains unclear whether bias patterns generalize across linguistic contexts. We investigate this question and introduce the stereotype perceptual map, a framework for analyzing how ethnic groups are positioned along evaluative dimensions. 
Using 900,000 model responses over 45,000 names spanning 9 ethnicities, we evaluate model behavior across prompt languages (English, Chinese, Thai), writing scripts (Latin, Chinese, Thai), evaluative domains (competence, warmth), and models (GPT, DeepSeek). We find that ethnic bias hierarchies are jointly shaped by local linguistic context and model origin and differ substantially between Western-centric and Sinocentric models. DeepSeek exhibits highly stable rankings across conditions in math competence judgments, consistently placing Chinese at the top, followed by Russian, and White, Hispanic, and Black names at the bottom. GPT, by contrast, shows strong script-dependent reordering: Latin-script conditions form one stable cluster, while native-script conditions form another, with substantially lower cross-cluster correlations. We term this script-gated bias: transliterating the same names into a non-Latin script can activate a different evaluative frame and produce rankings that are sometimes inversely correlated with Latin-script results. Warmth evaluations are less stable than competence across both models.
Our findings demonstrate that multilingual bias cannot be characterized through single-language, single-script audits. For multilingual users, code-switching between languages can toggle between different bias regimes. Fairness evaluations for multilingual LLMs must therefore account for deployment language, writing system, and model origin to capture the full range of potentially harmful stereotypes these systems exhibit.

Through the Looking Glass of Multilingual AI: Contrasting Language- and Name Script-Dependent Ethnic Hierarchies in GPT and DeepSeek

Bias benchmarks for LLMs largely focus on English, overlooking language- and culture-specific stereotypes. We introduce CrowS-Pairs-NL, a Dutch stereotype benchmark built by filtering, translating, and adapting the English CrowS-Pairs dataset to address known conceptual pitfalls, and extending it with newly crowdsourced Dutch sentence pairs. We evaluate six multilingual and Dutch-trained models using both a pseudo-log-likelihood metric adapted for autoregressive models and a prompt-based metric with three template variants. Models explicitly trained on Dutch data consistently exhibit higher stereotyping scores, suggesting that language-specific fine-tuning introduces language-specific bias. The two metrics broadly agree on model rankings but differ in sensitivity, with the prompt metric showing a narrower range of scores. Our benchmark and findings underscore the need for culturally grounded bias evaluation beyond English.

CrowS-Pairs-NL: A Benchmark to Evaluate Dutch Stereotype Bias in LLMs

Large language models (LLMs) are increasingly used to convert patient language into clinical-style summaries, yet patient symptom descriptions may vary across linguistic, cultural, and cross-linguistic contexts. In this pilot study, we operationalize this variation using four expression styles: direct English, indirect English, culturally mediated English, and Chinese-original patient language. We propose a compact red-teaming framework for testing whether LLM-based symptom interpretation changes when the same underlying concern is expressed in different linguistic and cultural forms. Our pilot dataset contains eight symptom scenarios, each expressed in four styles, yielding 32 vignettes before prompt variation. We evaluate GPT-5 mini as a pilot case-study model under generic and culture-aware prompts, repeating the full evaluation three times to produce 192 model outputs. Reference labels and a stratified subset of model output annotations were reviewed for face validity by an independent reviewer with clinical training.The model usually preserves broad symptom categories, but subtle failure modes emerge. Culture-aware prompting reduces severity downgrades from 14.6% to 9.4% and ambiguity-flagging failures from 28.1% to 13.5%, but does not reduce interpretation inconsistency or clinical category shift, both of which remain at 6.2%. Indirect English shows the highest severity-downgrade and flagging-failure rates, while Chinese-original expressions are often interpreted with the correct broad category but are not consistently flagged as ambiguous. These findings suggest that medical LLM evaluation should assess cultural robustness, severity framing, ambiguity preservation, and human-review escalation in addition to factual accuracy.

Lost in Translation: Cross-Cultural Bias in LLM-Assisted Medical Symptom Interpretation

We ask whether stereotype-loaded queries about culturally marked people leak more personal information from a retrieval-augmented generation (RAG) system than otherwise equivalent neutral queries. We pre-register a four-culture audit covering en-Anglo, es-LATAM, Arabic, and Hindi probes on a synthetic English PII corpus, comparing five paired query arms via the Stereotype-Trigger Leakage Delta (STLD). The locked confirmatory estimator was not run, so all reported tests are exploratory or sensitivity analyses, with deviations documented. We also identify a prompt-echo confound in the name-leakage metric: the model often re-emits the queried name, inflating apparent leakage without retrieval extraction. On cleaner non-name channels—email, phone, SSN-like identifier, and address—we find no stereotype-driven amplification for any culture after multiple-comparison correction. One name-included es-LATAM cell is significant in the negative direction, but matched-arm decomposition and an expanded culture-neutral control sensitivity suggest a high-leak control-predicate sampling artifact rather than a stereotype-treatment effect. Because the study is powered only for mid-sized effects and the culturally marked probe bank mixes stereotype content with cultural markers and heritage practices, we interpret the results as no detection—not evidence of no effect—of culturally marked predicate-triggered PII amplification under this synthetic-English RAG setting. The paper contributes a preregistered stereotype-as-privacy-side-channel test, diagnoses prompt-echo and predicate-resource confounds, and outlines release of the synthetic corpus, predicate bank, query generator, audit scripts, and analysis code upon acceptance

Exploratory As-Analyzed No-Detection of Culturally-Marked Predicate-Triggered PII Amplification in a Synthetic-English RAG Probe: A Predicate-Resource-Confounded Audit

Multilingual large language models exhibit systematic differences in their outputs across languages, even when representing the same underlying knowledge. Prior work has primarily focused on evaluating or reducing such inconsistencies. In this work, we instead study whether cross-lingual behavior can be controlled: specifically, whether answer distributions associated with other languages can be expressed under English prompting. To this end, we construct a human-annotated factual dataset and a cultural scenarios dataset, and compare intervention methods including persona prompting, activation steering, and preference-based fine-tuning. We evaluate how these methods affect answer distributions and their generalization to culturally grounded settings. Our results show that answer distributions can be systematically shifted toward those observed in other languages, with persona prompting consistently outperforming more complex intervention methods.

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Culturally Grounded Image Captioning in Indigenous Languages with Vision-Language Models: Cascaded and Single-Stage Approaches

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Culturally Grounded Image Captioning in Indigenous Languages with Vision-Language Models: Cascaded and Single-Stage Approaches

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USP at AmericasNLP 2026 Shared Task: Culturally-Aware Image Captioning for Indigenous Languages via Vision-Language Models and Fine-Tuned Neural Machine Translation

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