Mental imagery might fundamentally work differently than previously assumed, with implications for understanding memory formation, cognitive training, and therapeutic visualization practices. The traditional view holds that when you visualize something—a red apple, your childhood home—your brain activates the same neural circuits that would fire if you were actually seeing those objects.
New experimental evidence challenges this activation model by demonstrating that visual imagery instead operates through neural suppression. When participants mentally visualized specific orientations, their brains didn't amplify neurons corresponding to those imagined features. Rather, they suppressed neurons that would respond to nearby, non-imagined orientations. This creates a distinctive W-shaped neural response pattern around the imagined feature, contrasting sharply with the bell-shaped activation pattern that occurs during actual perception.
Researchers used clever psychophysical experiments combining imagery tasks with discrimination judgments, finding that mental imagery biases subsequent visual processing in ways consistent only with the suppression mechanism. When participants received actual perceptual cues instead of imagery instructions, their neural responses followed the traditional activation pattern, confirming the imagery-specific nature of this suppression effect.
This discovery reframes how we understand the neural basis of imagination and memory. If imagery works by dampening competing neural signals rather than boosting target ones, it suggests fundamentally different mechanisms underlie our ability to mentally rehearse, visualize goals, or recall experiences. The finding remains limited to basic visual features in laboratory settings, requiring replication across more complex imagery tasks and real-world applications before reshaping clinical or educational approaches to visualization training.