Two routes to expertise in mental rotation

Area of Science:

• Cognitive Psychology
• Neuroscience

Background:

• Mental rotation, the ability to mentally manipulate objects in 3D space, shows significant improvement with practice.
• The underlying mechanisms of this plasticity are debated, with theories focusing on algorithmic speed-up versus memory-based strategy shifts.

Purpose of the Study:

• To investigate the distinct cognitive and neural mechanisms underlying practice-related improvements in mental rotation.
• To provide evidence for an integrated explanation of practice effects by combining behavioral and electroencephalography (EEG) measures.

Main Methods:

• Two experiments were conducted using behavioral measures (response time) and EEG recordings.
• Participants underwent practice with either a small, familiar set of stimuli or a large, diverse set.

Main Results:

• Before practice, both response time and EEG negativity increased linearly with rotation angle, characteristic of mental rotation.
• Practice with a small stimulus set diminished these mental rotation signatures, despite performance gains.
• Practice with a large stimulus set maintained these signatures while improving performance, suggesting a different route to expertise.
• An early visual evoked potential increased with practice on the large stimulus set, indicating enhanced 3D information extraction.

Conclusions:

• Evidence supports two distinct routes to mental rotation expertise: one optimizing a general rotation algorithm and another relying on memory retrieval.
• Practice effects in mental rotation are not monolithic and depend on the nature of the training stimuli.
• Improved efficiency in visual information processing may contribute to faster mental rotation, particularly with diverse stimuli.