Developmental trajectory of the late positive potential: Using temporal-spatial PCA to characterize within-subject...

Area of Science:

• Neuroscience
• Developmental Psychology
• Cognitive Science

Background:

• The late positive potential (LPP) exhibits developmental changes, but prior research often used limited electrodes and averaged data.
• Understanding LPP's temporal and spatial dynamics is crucial for tracking cognitive development.

Purpose of the Study:

• To characterize temporal and spatial changes in the LPP across development using an empirically based approach.
• To quantify within-subject developmental changes in ERP timing and scalp distribution.

Main Methods:

• Utilized longitudinal data from 380 participants, recording LPP to emotional and neutral images at ages 9 and 12.
• Applied temporospatial principal component analysis (PCA) to within-subject subtraction-based ERPs.
• Analyzed changes in LPP amplitude and distribution related to age and pubertal development.

Main Results:

• A significant PCA factor showed increased LPP amplitude for emotional versus neutral pictures between ages 9 and 12.
• This factor was characterized by occipital negativity and frontocentral positivity around 850 ms post-stimulus.
• Factor scores correlated with pubertal development, suggesting a shift from occipital to frontocentral sites.

Conclusions:

• Temporospatial PCA offers a concise method for quantifying developmental changes in ERPs.
• LPP shifts from occipital to frontocentral areas during development, linked to pubertal maturation.
• This approach enhances the characterization of within-subject developmental shifts in ERP timing and scalp distribution.