These neurons send signals to the glomeruli within the olfactory bulb. Each glomerulus collects information from a specific olfactory receptor neuron. The olfactory signal is then conducted to the piriform cortex and the amygdala, and then to the orbitalfrontal cortex, where higher level processing of the odor occurs. Olfactory memory Olfactory memory is the recollection of a given smell. Research has found that odor memory is highly persistent and has a high resistance to interference, meaning these memories remain within an individual for long times despite possible interference of other olfactory memories. These memories are mostly explicit, though implicit forms of odor memory do provide some understanding of memory. Mammalian olfactory cues play an important role in the coordination of the mother infant bond, and the following normal development of the offspring. Olfactory memory is especially important for maternal behavior. Studies have shown that the fetus becomes familiar with olfactory cues within the uterus. This is demonstrated by research that suggests that newborns respond positively to the smell of their own amniotic fluid, meaning that fetuses learn from these cues in the womb. Environmental cues Environmental cues are all of the sensory cues that exist in the environment. With directed attention, an environmental cue becomes an attended cue. However, most environmental cues are assimilated subconsciously, as in visual contextual cueing. Environmental cues serve as the primary context that shapes how the world is perceived and as such they can prime prior experience to influence memory recall and decision making. This has applied use in marketing as there is evidence to suggest a store's atmosphere and layout can influence purchasing behavior. Environmental cues play a direct role in mediating the behavior of both plants and animals. For example, environmental cues, such as temperature change or food availability, affect the spawning behavior of fish. In addition to cues generated by the environment itself, cues generated by other agents, such as ant pheromone trails, can influence behavior to indirectly coordinate actions between those agents. In the study of perception, environmental cues play a large role in experimental design since these mechanisms evolved within a natural environment which gives rise to scene statistics and the desire to create a natural scene. If the experimental environment is too artificial, it can damage external validity in an ideal observer experiment that makes use of natural scene statistics. Cueing in Parkinson's disease Among the many problems associated