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Anna Marzecova on Muck Rack

Anna Marzecova

As seen in: BioRxiv, Brain Stimulation
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Articles

Patch-leaving decisions and pupil-linked arousal systems

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By Anna Marzecova, Luca F. Kaiser, Brent Vernaillen, Drita Hoxhaj
| BioRxiv
Abstract Deciding when to abandon a depleting resource in favour of potentially richer alternatives is fundamental to adaptive behaviour. Such patch-leaving decisions require balancing the expected advantage of leaving against both the cost of moving and the reward foregone in the current environment. Previous research suggests that activity of noradrenergic (NE) neurons in the locus coeruleus (LC) underpins patch-leaving.
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Tonic and phasic transcutaneous auricular vagus nerve stimulation (taVNS) both evoke rapid and transient pupil dilation

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By Lina I. Skora, Anna Marzecova, Gerhard Jocham
| Brain Stimulation Verified
Highlights • Transcutaneous auricular vagus nerve stimulation (taVNS) might affect noradrenergic activity. • Unclear if taVNS modes can map onto the phasic and tonic modes of noradrenergic activity. • We measure pupil dilation under phasic (1s) and tonic (30s) stimulation, within-subjects. • Both phasic and tonic taVNS evoke phasic pupil dilation, with no sustained tonic effect. • This has implications for phasic/tonic taVNS use in tasks.
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Tonic and phasic transcutaneous auricular Vagus Nerve Stimulation both evoke rapid and transient pupil dilation

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By Gerhard Jocham, Lina I. Skora, Anna Marzecova
| BioRxiv
Abstract Transcutaneous auricular vagus nerve stimulation (tVNS or taVNS) is a non-invasive method of electrical stimulation of the afferent branch of the vagus nerve, suggested to drive changes in putative physiological markers of noradrenergic activity, including pupil dilation. However, it is unknown whether taVNS can map onto the phasic and tonic modes of noradrenergic activity.
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