Advancing the neuroelectrophysiological understanding of attentional switching dysfunction in major depressive disorder

Table 3 Methodological paradigms for studying attentional switching in major depressive disorder: Advantages and event-related potential correlates

Paradigm	Core cognitive demand	Key attentional process probed	Primary ERP components of interest	Strengths for MDD research
Task-switching	Shift between different task rules (e.g., classify by color vs shape)	Cognitive flexibility, set reconfiguration, rule updating	SP, P300	Isolates “pure” executive switching, minimal emotional confound
Dual-task (as in Wu et al[9])	Perform two concurrent, alternating tasks	Divided attention, rapid resource sharing, interference management	N100, P200, P300, LPP across task transitions	High ecological validity, tests ability under load resembling daily life
Emotional variant of switching	Switch attention based on emotional vs non-emotional features	Interaction between affective processing and cognitive control	N170, P200, LPP; modulation of switch-related components by emotion	Directly tests the emotion-cognition interaction deficit central to MDD
Attentional blink with emotional stimuli	Identify targets in a rapid stream; emotional distractors are inserted	Temporal attention, vulnerability to emotional disruption	P3 to targets, attenuation of P3 by emotional distractors	Probes how emotion disrupts the attentional “gate” over time
Cue-target with emotional primes	Respond to a target preceded by an emotional or neutral cue	Attentional orienting and disengagement	Cue-locked LPP, target-locked P1/N1, P300	Dissociates the stages of attention: Engagement with cue vs. disengagement to target

ERP: Event-related potential; MDD: Major depressive disorder; LPP: Late positive potential; SP: Switch-related positivity.