Perturbation-evoked potentials: Significance and application in balance control research

Area of Science:

• Neuroscience
• Human motor control
• Somatosensory processing

Background:

• Historically, balance control was attributed solely to subcortical structures.
• Recent research highlights significant cortical involvement in human balance reactions.
• Perturbation-evoked potentials (PEPs) demonstrate cortical processing of postural disturbances.

Purpose of the Study:

• To review and synthesize existing research on perturbation-evoked potentials (PEPs).
• To emphasize the characteristics and significance of the PEP N1 component.
• To discuss implications for future research on PEPs in various populations.

Main Methods:

• Literature review of seminal studies on PEPs.
• Analysis of PEP components, including P1, N1, P2, and N2 potentials.
• Focus on factors influencing PEP characteristics.

Main Results:

• PEPs are broadly distributed over fronto-centro-parietal areas, with maximal amplitude at FCz/Cz.
• PEPs consist of distinct positive and negative potentials (P1, N1, P2, N2) at specific latencies.
• PEP components are modulated by perturbation specifics, postural set, and psychological factors.

Conclusions:

• Cortical structures play a vital role in human balance control.
• The PEP N1 component is a key indicator of cortical processing during postural perturbations.
• Further research on PEPs is needed in both healthy individuals and patient populations.