Human imagination is remarkably consistent across cultures, but even the largest AI language models fail to replicate it. A new study published on arXiv reveals the structural fingerprint of human mental imagery — and why current LLMs can't match it.
The research
Researchers Saurabh Ranjan and Brian Odegaard from the University of Florida analyzed vividness ratings from over 2,700 participants across Florida, Poland, and London using two well-validated questionnaires: the VVIQ-2 (visual imagery) and the PSIQ (multi-sensory imagery). They built psychological networks — maps of how different imagery items relate — and compared them across human populations and six large language models (Gemma3-12B/27B, Llama3.3-70B, and Llama4-16x17B).
Human networks showed strong cross-cultural consistency: centrality correlations ranged from r = 0.31 to 0.93 for measures like expected influence and closeness. Community detection recovered clusters that matched questionnaire themes (scene contexts for VVIQ-2: ARI = 0.27–0.40; sensory modalities for PSIQ: ARI = 0.87–1.0). However, betweenness centrality was unstable across all groups, revealing how personal experience shapes individual imagination links.
LLMs consistently failed. Centrality correlations with humans were weak and non-significant after correction. Most models produced degenerate single-cluster networks (median ARI = 0), meaning they treated all imagery items as equally connected — lacking the structured grouping seen in humans.
Why it matters
Your imagination isn't just a random collection of mental images. According to this study, it's organized like a network — shaped by your memory and embodied experience. This structure is shared across cultures, suggesting a fundamental cognitive architecture. That AI can't replicate it suggests current language models, trained only on text, lack the sensorimotor grounding that comes from living in a body. For brain training, this highlights that imagination may be a uniquely human cognitive skill worth exercising.
What you can do
To strengthen your imagination network, practice multi-sensory visualization: imagine not just a scene, but the sounds, smells, and textures. Regularly describe memories in vivid detail, engaging different senses. This may help reinforce the cross-modal connections that make human imagination so rich.
Source: arXiv q-bio.NC
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