Visual imagery is information which passes through the brain as though something is being perceived, when nothing is actually happening. Someone may experience sight, smell, sound, and touch as a result of visual imagery when none of these stimuli are present. Also known as a mental image, visual imagery is a topic of great interest in psychology and neuroscience, and it has a number of potentially very interesting applications.

Many people are familiar with the idea of visual imagery; they might think of it as the imagination. Sometimes, it is possible to muster up a very real scene inside the mind. For example, one might imagine a sunset on the beach and hear the waves, smell the seaweed, feel a breeze, and clearly see the rich colors of the sunset as the Sun drops below the horizon. All of this imagery is going on entirely inside the mind, no matter how real it feels.

Imagination actually appears to play an important role in brain function. Children, for example, often use imagination as they are acquiring knowledge to help them process and reconcile the knowledge. Imagination is also a vital trait for people who make their living through creative work such as writing, painting, or sculpting.

In psychology, visual imagery has a long use in therapy. People learning stress management techniques are often encouraged to use visual imagery to take a mental vacation out of a stressful situation, for example. People may be guided through visualizations as part of the therapeutic process when they process trauma or deal with other issues. A psychologist may also use visual imagery as a form of assessment, to see how well a client is functioning.

Guided imagery has also been used in meditation by many cultures for centuries. Meditation is a practice especially associated with Asian religious traditions, but in fact people in all cultures have a history of meditation. Some devout Catholics, for example, visualize during prayer to help God get the message, while meditation and the imagination are also harnessed in Native American prayer ceremonies.

Neurologists are often interested in scanning the brains of people who are very skilled at visual imagery, to learn more about which areas of the brain activate during imagination sessions. People may also be asked to visualize during brain scans which are designed to assess the extent of damage or injury. People also use visual imagery every time they read a book and feel like they are living in a story, or whenever they daydream.