心的回転

Visual mental imagery is the ability to conjure images in your mind's eye, allowing you to process visual material beyond your current viewpoint. This capacity supports important behaviors like visualizing routes when planning directions, imagining how objects might look if remodeled, and mentally rotating objects to consider how they fit into spaces or clear barriers.

The mental rotation paradigm presents participants with rotated characters and asks them to distinguish whether each is a rotation of the original item or its mirror image. Participants respond as quickly and accurately as possible, with response time serving as the dependent variable. This procedure reveals how the brain simulates physical transformations of objects.

Mental rotation experiments typically use letters and numbers, such as R, g, 4, and 7, printed in Helvetica Light font. Two versions of each character are created: the original and a flipped mirror image. Each character is then rotated by increasing increments of 15 degrees, starting at 0 degrees and ending at 180 degrees.

Response times increase proportionally with the degree of rotation, meaning participants respond faster to characters with little rotation and slower to those rotated the most. This pattern suggests that the brain simulates the physical transformations of objects, mentally rotating them step-by-step rather than instantly recognizing rotated versions.

Participants are presented with test pages one at a time. An assistant starts a timer and says 'Go,' then the experimenter flips over a page. The participant reports their response, the timer stops, and the response time and answer are recorded. This procedure repeats for all trials, typically 52 pages, with responses and times documented on a response sheet.

Functional magnetic resonance imaging shows enormous brain activity in the visual cortex and parietal lobe during mental rotation, areas typically involved in seeing. This indicates that the brain systems used to actually see visual stimuli are also used to imagine visual stimuli, demonstrating the neural overlap between perception and mental imagery.

Individuals exceptionally good at using mental imagery to guide actions, such as architects and mechanical engineers, excel at mental rotation tasks. The mental rotation paradigm effectively identifies people with strong visual thinking abilities about physical spaces. Researchers also use virtual reality to study how mental imagery supports spatial navigation and obstacle avoidance.