Conspecific images require longer visual processing than simple stimuli in healthy four-week old piglets

Area of Science:

• Neuroscience and behavioral science
• Animal models in research

Background:

• Swine serve as valuable neurobehavioral models.
• Visual event-related potentials (VERPs) are an electroencephalogram (EEG) technique used to assess visual processing and brain function.
• VERPs can detect sensory changes following trauma or disease.

Purpose of the Study:

• To investigate piglet visual EEG processing of 2D conspecific images compared to a simple white square.
• To establish a healthy reference for VERPs in piglets for future neurological studies.

Main Methods:

• VERPs were measured in healthy piglets (N=5) exposed to 2D conspecific (CS) images and a white square (WS) stimulus.
• EEG waveforms were analyzed using a source localization model to estimate cortical activity.
• Key metrics included N1 and P2 amplitudes, latencies, and current density.

Main Results:

• Conspecific images (CS) resulted in longer N1 and P2 latencies compared to the white square (WS), indicating longer visual processing times for detailed images.
• Contrary to the hypothesis, CS stimuli showed lower P2 amplitudes and current density, suggesting reduced processing power needed.
• Differences in stimulus brightness (lux) may have influenced amplitude results.

Conclusions:

• Piglet visual processing is sensitive to subtle stimulus features, as evidenced by latency differences.
• These findings provide a crucial healthy reference dataset for VERP studies in piglets, particularly for research involving brain injury or neurological diseases affecting vision.