Temporal orienting of attention is interfered by concurrent working memory updating

Area of Science:

• Cognitive Neuroscience
• Psychology
• Electrophysiology

Background:

• Temporal orienting of attention allows anticipation of events based on timing cues.
• Working memory tasks can interfere with attentional processes.
• Previous research indicated behavioral dissociation between temporal orienting and sequential effects under dual-task conditions.

Purpose of the Study:

• To investigate the neural mechanisms underlying the behavioral dissociation between temporal orienting and sequential effects during concurrent working memory load.
• To examine event-related potential (ERP) differences between single-task and dual-task performance.

Main Methods:

• Participants performed temporal orienting tasks under single-task and dual-task conditions (concurrent working memory).
• Event-related potentials (ERPs) were recorded, focusing on cue-locked and target-locked components.
• Behavioral measures of temporal orienting and sequential effects were collected.

Main Results:

• Behavioral results replicated previous findings: temporal orienting was impaired, while sequential effects were preserved under dual-task conditions.
• Single-task ERPs showed modulations of contingent negative variation (CNV), N2, and P3 by temporal orienting and sequential effects.
• Dual-task performance abolished CNV, N2, and P3 modulations related to temporal orienting, but early target-locked P1/N1 modulations for sequential effects persisted.

Conclusions:

• Concurrent working memory tasks selectively interfere with neural correlates of temporal orienting of attention.
• Sequential effects show greater neural resilience to working memory load, particularly at early sensory processing stages.
• Electrophysiological data provide direct neural evidence for the selective impact of cognitive load on distinct attentional control mechanisms.