Description
Vision plays a crucial role in navigation, particularly when tasks require spatial awareness and quick decision-making. Following loss of vision, compensatory approaches are needed to navigate, including use of other senses, memory of a journey (path retracing) and calculation of a homing path (path integration). Although it is commonly assumed that memory is too imprecise to serve as a reliable substitute for vision, this assumption has not been rigorously tested. Using mouse models of retinitis pigmentosa (Pde6brd1/rd1) in an open-field arena, we investigated the extent to which memory can compensate for vision loss. Surprisingly, we found that rd1 mice were able to recall the location of an escape door with high precision. Moreover, rd1 mice showed enhanced path retracing and path integration compared to wild-type controls, suggesting not just compensation but strengthening of memory-based navigation strategies. While their behaviour showed some differences to wild-type mice, overall performance indicates that memory can serve as a highly effective, even enhanced, mechanism for navigation in the absence of vision. These findings highlight the remarkable adaptability of navigation strategies despite visual impairment and may have important implications for understanding retinal degeneration in humans and developing interventions to assist visually impaired individuals in navigating complex environments.
Lay Abstract
How does the brain adapt when vision is lost? As we move through the world, memory of past movements and input from other senses can help make up for the absence of sight. However, it is still not fully understood how far these strategies can go in replacing vision. Our research aims to explore this question in both mice and humans. Here, we report findings from our studies in mice, where we investigated how visually impaired navigate an open-field arena without relying on sight. Although sighted mice had an advantage, we found that visually impaired mice, despite having little or no functional vision, were often able to find the escape door with surprising precision. Even more strikingly, they were better at remembering and retracing their routes, suggesting that they rely more strongly on memory to guide their movements. These results suggest that memory and other senses can compensate for vision loss more effectively than previously assumed. Overall, this work highlights the brain’s remarkable capacity to adapt and provides new insight into navigation in the absence of vision, with potential implications for improving independence and mobility in people with visual impairments.
| Lay Title | Enhanced spatial mapping in a mouse model of inherited blindness |
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| Role | Research Assistant |