Flashing Lights Induce Prolonged Distortions in Visual Cortical Responses and Visual Perception

Area of Science:

• Neuroscience
• Visual System Research
• Sensory Perception

Background:

• The primary sensory neocortex forms environmental representations, with circuit reorganization modifying sensory perception.
• Activity-dependent plasticity drives cortical reorganization, especially during early development.
• Long-term plasticity in the mature brain has been challenging to induce noninvasively.

Purpose of the Study:

• To introduce a novel method for noninvasively inducing long-term plasticity in the mature brain.
• To investigate the effects of transient visual stimuli on visual cortical processing and behavior.
• To explore the potential of flashing light stimuli as a tool for studying visual function and plasticity.

Main Methods:

• Utilized primary visual cortex (V1) in mice.
• Applied transient visual stimuli (flashing lights) to induce plasticity.
• Presented drifting grating stimuli during flash-evoked responses.
• Measured V1 neuronal responsiveness and visually driven behaviors.
• Investigated the role of N-methyl-d-aspartate (NMDA) receptor activation.

Main Results:

• Flashing lights induced a long-delayed response in V1 that persisted for seconds.
• Repetitive grating stimuli during the flash response decreased V1 neuron responsiveness.
• This flash stimulus-induced underrepresentation was specific to stimulus direction and impaired motion detection.
• Neurophysiological and behavioral plasticity persisted for hours and required NMDA receptor activation.

Conclusions:

• Simple flashing light stimuli can noninvasively induce long-term plasticity in the mature visual cortex.
• This plasticity modifies visual cortical processing, visually driven behaviors, and motion perception.
• Flashing light stimuli serve as a valuable experimental tool for investigating visual function and plasticity beyond critical developmental periods.