MAME: Multidimensional Adaptive Metamer Exploration with Human Perceptual Feedback

• URL: http://arxiv.org/abs/2503.13212v1
• Date: Mon, 17 Mar 2025 14:23:04 GMT
• Title: MAME: Multidimensional Adaptive Metamer Exploration with Human Perceptual Feedback
• Authors: Mina Kamao, Hayato Ono, Ayumu Yamashita, Kaoru Amano, Masataka Sawayama,
• Abstract summary: A widely adopted approach to explore functional alignment is to identify metamers for both humans and models.<n>We propose the Multidimensional Adaptive Metamer Exploration framework, enabling direct high-dimensional exploration of human metameric space.<n>Our framework has the potential to contribute to developing interpretable AI and understanding of brain function in neuroscience.
• Score: 1.1317941257922182
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: Alignment between human brain networks and artificial models is actively studied in machine learning and neuroscience. A widely adopted approach to explore their functional alignment is to identify metamers for both humans and models. Metamers refer to input stimuli that are physically different but equivalent within a given system. If a model's metameric space completely matched the human metameric space, the model would achieve functional alignment with humans. However, conventional methods lack direct ways to search for human metamers. Instead, researchers first develop biologically inspired models and then infer about human metamers indirectly by testing whether model metamers also appear as metamers to humans. Here, we propose the Multidimensional Adaptive Metamer Exploration (MAME) framework, enabling direct high-dimensional exploration of human metameric space. MAME leverages online image generation guided by human perceptual feedback. Specifically, it modulates reference images across multiple dimensions by leveraging hierarchical responses from convolutional neural networks (CNNs). Generated images are presented to participants whose perceptual discriminability is assessed in a behavioral task. Based on participants' responses, subsequent image generation parameters are adaptively updated online. Using our MAME framework, we successfully measured a human metameric space of over fifty dimensions within a single experiment. Experimental results showed that human discrimination sensitivity was lower for metameric images based on low-level features compared to high-level features, which image contrast metrics could not explain. The finding suggests that the model computes low-level information not essential for human perception. Our framework has the potential to contribute to developing interpretable AI and understanding of brain function in neuroscience.

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