Individualised Transcranial Magnetic Stimulation Targeting of the Left Dorsolateral Prefrontal Cortex for Enhancing...

Area of Science:

• Neuroscience
• Cognitive Science
• Neuromodulation

Background:

• Repetitive transcranial magnetic stimulation (rTMS) shows potential for cognitive enhancement in neuropsychiatric disorders, but effects are often limited.
• Individualized targeting may improve the efficacy of rTMS for cognitive enhancement.
• The left dorsolateral prefrontal cortex (L-DLPFC) is a key area for cognitive functions like flexibility.

Purpose of the Study:

• To investigate the efficacy of a novel, individualized targeting approach for rTMS to enhance cognitive flexibility.
• To determine if targeting the L-DLPFC based on individual cognitive task performance improves cognitive flexibility.

Main Methods:

• Forty healthy participants underwent a single session of intermittent theta burst stimulation (iTBS).
• Target site in the L-DLPFC was individualized based on performance in a random letter generation task.
• A cross-over, single-blinded design compared individualized L-DLPFC iTBS, an active control, and sham iTBS.
• Cognitive flexibility was assessed using the Task Switching task and the Colour-Word Stroop test.

Main Results:

• No significant difference was found in switch reaction times on the Task Switching task across conditions.
• No significant improvements were observed in any secondary cognitive outcome measures.
• The individualized targeting method did not enhance cognitive flexibility in healthy participants.

Conclusions:

• The novel individualized targeting methodology for rTMS did not prove effective for enhancing cognitive flexibility.
• Further research exploring alternative targeting strategies is necessary to optimize rTMS for cognitive enhancement.
• Current findings suggest limitations in using performance-based L-DLPFC targeting for cognitive flexibility improvements.