Apples seem to have become the internet’s symbol for imagination—or at least, mental imagery. Every so often, someone takes to X or Reddit and asks what other users see when they imagine an apple. Those with aphantasia don’t see anything in their mind’s eye, while those with hyperphantasia imagine elaborately detailed objects and scenarios that seem almost lifelike. So does our , though research tends to favor visual imagery, according to the 2019 paper. She and her team used functional magnetic resonance imaging (fMRI) to measure blood flow in the brains of a pair of identical twins as they performed mental imagery tasks.