Transcranial Random Noise Stimulation Boosts Early Motion Perception Learning Rather than the Later Performance...

Area of Science:

• Neuroscience
• Cognitive Science
• Visual Perception

Background:

• The impact of transcranial random noise stimulation (tRNS) on visual perceptual learning is not fully understood, particularly its effects beyond initial training.
• Previous studies have primarily focused on the early phases of learning.

Purpose of the Study:

• To investigate the influence of tRNS on visual perceptual learning during both early and later stages of training.
• To determine if tRNS applied during a plateau phase of learning affects performance.

Main Methods:

• Participants underwent 11 days of training on a coherent motion direction identification task.
• Three groups were used: continuous tRNS, tRNS during Stage 2 only, and sham stimulation during Stage 2.
• Coherence thresholds were measured before training, after 8 days (Stage 1), and after 11 days (Stage 2).

Main Results:

• tRNS applied during early training facilitated visual learning by decreasing thresholds.
• However, tRNS did not improve performance during the plateau phase (Stage 1) or subsequent continued training (Stage 2).
• Compared to sham stimulation, tRNS did not enhance plateau thresholds.

Conclusions:

• tRNS can accelerate visual perceptual learning in its initial phase.
• The facilitatory effects of tRNS on visual learning are transient and disappear with continued training.
• tRNS does not appear to enhance performance once a learning plateau is reached.