Modulation of selective attention by polarity-specific tDCS effects

Area of Science:

• Cognitive Neuroscience
• Neuroscience
• Psychology

Background:

• Selective attention depends on working memory to prioritize tasks.
• Distractor processing can occur even with low working memory load.
• The Dorsolateral Prefrontal Cortex (DLPFC) is crucial for attention and working memory.

Purpose of the Study:

• To investigate if transcranial direct current stimulation (tDCS) of the DLPFC can reduce emotional distractor interference.
• To assess the role of DLPFC activity modulation in enhancing selective attention.

Main Methods:

• Utilized transcranial direct current stimulation (tDCS) targeting the Dorsolateral Prefrontal Cortex (DLPFC).
• Administered anodal and cathodal tDCS to modulate DLPFC activity.
• Assessed the impact of stimulation on interference from emotional distractors (angry and happy).

Main Results:

• Anodal tDCS over the DLPFC did not reduce interference from angry distractors.
• Cathodal tDCS over the DLPFC reduced interference from happy distractors, improving performance.
• Altering DLPFC activity alone was insufficient for robust top-down control.

Conclusions:

• Modulating DLPFC activity via tDCS has differential effects on emotional distractor interference.
• Cathodal tDCS shows potential in mitigating specific types of emotional distraction.
• Top-down control of selective attention may require more complex neural mechanisms than DLPFC modulation alone.