Between 1 and 4 percent of people have a neurological trait called synaesthesia, where activating one sense involuntarily triggers another. The phenomenon is so common that it is not considered abnormal. Two theories suggest that synaesthetes have more neural connections than the average brain, possibly due to a process called synaptic pruning that didn't fully perform. Another suggests that the brain structure is the same as everyone else's, but certain pathways are more active. These neurological differences may result in a more associative, generative way of thinking. A survey of Australian synaesthes found that around 24 percent worked in creative fields compared to less than 2 percent of the general population.