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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Clinical Psychology

Background:

  • Adolescent depression prevalence is rising, especially in females, yet its pathophysiology is poorly understood.
  • Event-related potentials (ERPs) offer a method to study cognitive-affective processes in adolescent depression, particularly negative self-referential biases.
  • Self-referential processing and cognitive factors like maladaptive self-view are implicated in depression.

Purpose of the Study:

  • To investigate event-related potential (ERP) differences in self-referential processing between healthy and depressed female adolescents.
  • To examine the relationship between ERP components (P1, P2, LPP) and cognitive processes (maladaptive self-view, self-criticism) in adolescent depression.
  • To identify intracortical sources of observed ERP effects using low-resolution electromagnetic tomography (LORETA).

Main Methods:

  • A self-referential encoding task was administered to healthy (n=30) and depressed (n=22) female adolescents.
  • ERP data, including P1, P2, and late positive potential (LPP) amplitudes, were recorded in response to negative and positive words.
  • Low-resolution electromagnetic tomography (LORETA) was used to probe intracortical sources of ERP effects.

Main Results:

  • Depressed females endorsed more negative and fewer positive words, with poorer recall/recognition of positive words.
  • Depressed adolescents showed greater P1 amplitudes to negative words, linked to maladaptive self-view and self-criticism.
  • Depressed females exhibited greater early and late LPP activity for negative versus positive words; healthy females showed the opposite pattern.
  • LORETA indicated reduced inferior frontal gyrus activity for negative words in depressed versus healthy females for both P1 and LPP.

Conclusions:

  • The P1 and LPP components reflect biased self-referential processing in female adolescents with depression.
  • Findings suggest specific neural mechanisms underlying cognitive-affective biases in adolescent depression.
  • Results have potential implications for understanding and treating depression in adolescent females.