Effects of prior stimulation on tactile evoked epidural field potentials in rat S1 cortex

Understanding how tactile sensation is processed in the somatosensory cortex is crucial for the development of neuroprostheses that can provide a realistic sense of touch. Exploring the electrophysiological basis of vibrotactile forward masking offers valuable insights into how the brain integrates and responds to sequential sensory inputs. This understanding can help drive progress in the development of haptic interfaces and the enhancement of neuroprosthetic technologies designed to improve tactile perception. Epidural field potentials were recorded from the hind paw representation of the rat S1 cortex by using various experimental parameters. The effects of the prior stimulus on the test stimulus window measured as dB difference and latency difference were evaluated. The results indicated that all main factors had a significant impact on the dB difference. An increase in the amplitude of the prior stimulus was found to enhance suppression effects. The suppression decreased as the temporal gap increased. By demonstrating the impact of the prior stimulus, the study underscores the fundamental influence of preceding sensory inputs in shaping subsequent sensory processing.