Perceptual Learning of Multiple Object Tracking Is Not Enhanced by Transcranial Random Noise Stimulation of hMT

Area of Science:

• Cognitive Neuroscience
• Visual Perception

Background:

• Multiple Object Tracking (MOT) measures the capacity to monitor several moving targets.
• Perceptual learning is a process through which experience enhances visual performance.

Purpose of the Study:

• To determine if perceptual learning improves MOT performance in visually normal adults.
• To investigate if high-frequency transcranial random noise stimulation (hf-tRNS) over the human middle temporal complex (hMT+) can further enhance MOT performance gains from perceptual learning.

Main Methods:

• Nineteen adults with normal vision participated in the study.
• Participants underwent MOT training for 8 days, with some receiving hf-tRNS over hMT+ and others receiving sham stimulation.
• MOT performance was assessed at baseline, during training, and post-intervention.

Main Results:

• A significant improvement in MOT performance was observed due to training (P < 0.001).
• MOT performance improvements were evident from day 2 of training and plateaued by day 5.
• No significant difference was found between the hf-tRNS group and the sham stimulation group, indicating hf-tRNS did not modulate training effects.

Conclusions:

• Perceptual learning effectively enhances MOT performance in adults with normal vision.
• hf-tRNS applied to the hMT+ area did not provide additional benefits to MOT performance beyond perceptual learning alone.