Neural manifolds for odor-driven innate and acquired appetitive preferences

Abstract

Sensory stimuli evoke spiking neural responses that innately or after learning drive suitable behavioral outputs. How are these spiking activities intrinsically patterned to encode for innate preferences, and could the neural response organization impose constraints on learning? We examined this issue in the locust olfactory system. Using a diverse odor panel, we found that ensemble activities both during ( ON response) and after stimulus presentations ( OFF response) could be linearly mapped onto overall appetitive preference indices. Although diverse, ON and OFF response patterns generated by innately appetitive odorants were still limited to a low-dimensional subspace (a neural manifold). Similarly, innately non-appetitive odorants evoked responses that were separable yet confined to another neural manifold. Notably, only odorants that evoked neural response excursions in the appetitive manifold were conducive for learning. In sum, these results provide insights on how encoding for innate preferences can also set limits on associative learning.