Elsevier

Journal of Psychiatric Research

Volume 38, Issue 5, September–October 2004, Pages 513-520
Journal of Psychiatric Research

Effect of 5 Hz repetitive transcranial magnetic stimulation on cognition during a Go/NoGo task

https://doi.org/10.1016/j.jpsychires.2004.01.006Get rights and content

Abstract

Repetitive transcranial magnetic stimulation (rTMS) has been developed as a novel tool for modulating cognition by delivering stimulation in the brain. However, the effects of rTMS on cognition are still controversial. This randomized, sham-controlled, crossover study was designed to determine whether rTMS of the left dorsolateral prefrontal cortex (DLPFC) interferes with the Go/NoGo task and whether personal parameters such as age affect rTMS. A total of 24 healthy subjects (12 male and 12 female, aged 20–37 years) underwent one session of active rTMS followed by sham rTMS (total of 1600 pulses, 100% of motor threshold, 5 Hz, 8 s), or vice versa. The results did not show any differences between active and sham rTMS stimulation in terms of performance accuracy, response speed, or choice reaction time (cRT) implicating that short-term rTMS will not enhance or deteriorate cognition. However, percentage cRT shortening induced by active rTMS was negatively correlated with age (r=−0.57, P=0.005), whereas that induced by sham rTMS was not (r=−0.23, P>0.05), suggesting that cognition of younger subjects might have greater modulation by active stimulation than older ones. This finding may help explain some of the controversies or paradoxical results observed in studies of the effect of left DLPFC rTMS on cognition.

Introduction

Repetitive transcranial magnetic stimulation (rTMS) is a novel, noninvasive tool for the manipulation of neuronal activities in the human brain. In several studies, cognitive function could be modulated through rTMS delivered over the cerebral cortex in healthy subjects and in patients with brain diseases (Grafman and Wassermann, 1999; Huber et al., 2003). Conversely, other studies failed to demonstrate the effect of rTMS on cognition (Jahanshahi and Rothwell, 2000). To date, the effects of rTMS on cognition are still controversial, and the mechanisms by which rTMS influences cognition also remains unclear. Many personal parameters are known to possibly affect the effect of rTMS in treating depression. These parameters include psychotic features, age, previous responses to rTMS, and underlying brain physiologic markers (Gershon et al., 2003). However, most studies of the effect of rTMS on cognition have focused on effectiveness only. Unlike the effect of rTMS in treating depression, little is known about how personal factors might account for the disparity of results from studies of cognition and rTMS. To see the effect of rTMS on performance of cognition, we used the Go/NoGo task as a test battery for attentional performance. Thus, our aims were (1) to investigate whether a single session of rTMS applied to the left dorsolateral prefrontal cortex (DLPFC) interferes with performance on a Go/NoGo task performance in healthy subjects and (2) to determine whether age might account for the disparity in results that has shown in the treatment of depression (Figiel et al., 1998; Kozel et al., 2000; Janicak et al., 2002).

Section snippets

Subjects

Twenty-four subjects (12 men and 12 women; age, 20–37 years; mean ± standard deviation [SD], 27.0 ± 4.7 years) were recruited through local advertisement. Subjects were all right-handed and were naive to transcranial magnetic stimulation (TMS) and the Go/NoGo task. Subjects were screened for psychiatric disorders and substance or alcohol abuse by means of the Mini-International Neuropsychiatric Interview (Sheehan et al., 1998) and excluded if these were present. Those with significant physical

Results

The two groups (active/sham vs. sham/active) were not significantly different in terms of age, years of education, MT, or baseline cRT and error rate scores. The results of comparison showed in Table 1. Further analysis also demonstrated no significant carry-over or period effects in on cRT (P>0.05) or error rate (P>0.05), indicating that the order effect did not influence the results. No subjective or objective adverse effects were observed in any subject during stimulation.

Discussion

The present study showed that a single rTMS session of either active or sham stimulation did not influence the accuracy of performance on a Go/NoGo task. Similarly, it did not influence the cRT on this cognitive test. However, we found that the response after active stimulation may have been faster in younger subjects than in older ones.

The Go/NoGo task is a common tool for assessing cognition. A previous study showed an impaired ability to perform Go/NoGo task with DLPFC lesions (Godefroy et

Conclusion

Consistent with most of previous results, our findings did not show changes in accuracy or influence in the speed of responses to a Go/NoGo task after rTMS with a single active session, implying that a short-term active rTMS will neither enhancing nor deteriorating cognition. Further analysis revealed that improvement of the speed response, correlated with age and suggested that age factor might be critical in determining the effect of rTMS applied to the left DLPFC on cognition. This is

Acknowledgements

This work was supported by a grant from Taipei Veterans General hospital (VGH-91-237).

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