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Inverse effects of tDCS over the left versus right DLPC on emotional processing : a pupillometry study

(2019) PLOS ONE. 14(6).
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The integrative neuroscience of behavioral control (Neuroscience)
Abstract
Background and objectives : The Dorsolateral prefrontal cortex (DLPFC) is implicated in cognitive and emotional responses. Yet, research that investigates the causal role of the left versus right DLPFC during the processes of emotion appraisal is lacking. In the current study, transcranial direct current stimulation (tDCS) was used to disentangle the functional lateralization of the DLPFC on emotional processing in response to the anticipation of, and subsequent confrontation with emotional stimuli in healthy volunteers. Methods : Forty-eight subjects received both active and sham (on separate days) anodal tDCS over either the left (N = 24) or right (N = 24) DLPFC. Subjects' pupil dilation (PD, a physiological marker of cognitive resource allocation) was recorded while performing an appraisal task in which negative and positive emotion eliciting images were presented, each preceded by an informative cue indicating the valence of the upcoming stimulus. Results : As compared to sham stimulation, left DLPFC anodal tDCS resulted in increased PD when confronted with negative emotional images, whereas right DLPFC anodal tDCS resulted in decreased PD when confronted with emotional images, irrespective of valence. Limitations : The interpretation of pupil dilation in response to emotional stimuli is limited. Conclusion : These findings suggest inverse lateralized DLPFC effects on cognitive resource allocation (as measured by pupillary responses) when confronted with emotional stimuli. The current findings may shed some light on mechanisms that explain the antidepressant effects of non-invasive brain stimulation of the left DLPFC.
Keywords
DORSOLATERAL PREFRONTAL CORTEX, DIRECT-CURRENT STIMULATION, HEART-RATE-VARIABILITY, COGNITIVE-CONTROL, ATTENTIONAL DISENGAGEMENT, PUPIL-DILATION, DEPRESSION, RTMS, MODULATION, RESPONSES

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Citation

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MLA
Allaert, Jens, et al. “Inverse Effects of TDCS over the Left versus Right DLPC on Emotional Processing : A Pupillometry Study.” PLOS ONE, vol. 14, no. 6, 2019.
APA
Allaert, J., Sanchez-Lopez, A., De Raedt, R., Baeken, C., & Vanderhasselt, M.-A. (2019). Inverse effects of tDCS over the left versus right DLPC on emotional processing : a pupillometry study. PLOS ONE, 14(6).
Chicago author-date
Allaert, Jens, Alvaro Sanchez-Lopez, Rudi De Raedt, Chris Baeken, and Marie-Anne Vanderhasselt. 2019. “Inverse Effects of TDCS over the Left versus Right DLPC on Emotional Processing : A Pupillometry Study.” PLOS ONE 14 (6).
Chicago author-date (all authors)
Allaert, Jens, Alvaro Sanchez-Lopez, Rudi De Raedt, Chris Baeken, and Marie-Anne Vanderhasselt. 2019. “Inverse Effects of TDCS over the Left versus Right DLPC on Emotional Processing : A Pupillometry Study.” PLOS ONE 14 (6).
Vancouver
1.
Allaert J, Sanchez-Lopez A, De Raedt R, Baeken C, Vanderhasselt M-A. Inverse effects of tDCS over the left versus right DLPC on emotional processing : a pupillometry study. PLOS ONE. 2019;14(6).
IEEE
[1]
J. Allaert, A. Sanchez-Lopez, R. De Raedt, C. Baeken, and M.-A. Vanderhasselt, “Inverse effects of tDCS over the left versus right DLPC on emotional processing : a pupillometry study,” PLOS ONE, vol. 14, no. 6, 2019.
@article{8621579,
  abstract     = {Background and objectives : The Dorsolateral prefrontal cortex (DLPFC) is implicated in cognitive and emotional responses. Yet, research that investigates the causal role of the left versus right DLPFC during the processes of emotion appraisal is lacking. In the current study, transcranial direct current stimulation (tDCS) was used to disentangle the functional lateralization of the DLPFC on emotional processing in response to the anticipation of, and subsequent confrontation with emotional stimuli in healthy volunteers. 
Methods : Forty-eight subjects received both active and sham (on separate days) anodal tDCS over either the left (N = 24) or right (N = 24) DLPFC. Subjects' pupil dilation (PD, a physiological marker of cognitive resource allocation) was recorded while performing an appraisal task in which negative and positive emotion eliciting images were presented, each preceded by an informative cue indicating the valence of the upcoming stimulus. 
Results : As compared to sham stimulation, left DLPFC anodal tDCS resulted in increased PD when confronted with negative emotional images, whereas right DLPFC anodal tDCS resulted in decreased PD when confronted with emotional images, irrespective of valence. 
Limitations : The interpretation of pupil dilation in response to emotional stimuli is limited. 
Conclusion : These findings suggest inverse lateralized DLPFC effects on cognitive resource allocation (as measured by pupillary responses) when confronted with emotional stimuli. The current findings may shed some light on mechanisms that explain the antidepressant effects of non-invasive brain stimulation of the left DLPFC.},
  articleno    = {e0218327},
  author       = {Allaert, Jens and Sanchez-Lopez, Alvaro and De Raedt, Rudi and Baeken, Chris and Vanderhasselt, Marie-Anne},
  issn         = {1932-6203},
  journal      = {PLOS ONE},
  keywords     = {DORSOLATERAL PREFRONTAL CORTEX,DIRECT-CURRENT STIMULATION,HEART-RATE-VARIABILITY,COGNITIVE-CONTROL,ATTENTIONAL DISENGAGEMENT,PUPIL-DILATION,DEPRESSION,RTMS,MODULATION,RESPONSES},
  language     = {eng},
  number       = {6},
  pages        = {16},
  title        = {Inverse effects of tDCS over the left versus right DLPC on emotional processing : a pupillometry study},
  url          = {http://dx.doi.org/10.1371/journal.pone.0218327},
  volume       = {14},
  year         = {2019},
}

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