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Effects of nicotine on smooth pursuit eye movements in healthy non-smokers

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Abstract

Rationale

The non-selective nicotinic acetylcholine receptor (nAChR) agonist nicotine has been argued to improve attention via enhanced filtering of irrelevant stimuli. Here, we tested this hypothesis in the context of smooth pursuit eye movements (SPEMs), an oculomotor function previously shown to improve with nicotine in some but not all studies.

Objectives

In order to test whether nicotine improves performance particularly when the inhibition of distracting stimuli is required, SPEM was elicited in conditions with or without peripheral distractors. Additionally, different target frequencies were employed in order to parametrically vary general processing demands on the SPEM system.

Methods

Healthy adult non-smokers (N = 18 females, N = 13 males) completed a horizontal sinusoidal SPEM task at different target frequencies (0.2 Hz, 0.4 Hz, 0.6 Hz) in the presence or absence of peripheral distractors in a double-blind, placebo-controlled, cross-over design using a 2 mg nicotine gum.

Results

Nicotine increased peak pursuit gain relative to placebo (p < .001), but an interaction with distractor condition (p = .001) indicated that this effect was most pronounced in the presence of distractors. Catch-up saccade frequency was reduced by nicotine (p = .01), particularly at higher target frequencies (two-way interaction, p = .04). However, a three-way interaction (p = .006) indicated that the reduction with nicotine was strongest at the highest target frequency (0.6 Hz) only without distractors, whereas in the presence of distractors, it was strongest at 0.4-Hz target frequency. There were no effects of nicotine on subjective state measures.

Conclusions

Together, these findings support a role of both distractor inhibition and general processing load in the effects of nicotine on smooth pursuit.

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Notes

  1. A sinusoidal target waveform refers to the changing pattern of target velocity over time, which reflects a smooth periodic oscillation horizontally across the screen.

  2. In agreement with the wider SPEM literature, the continuously changing velocity of a sinusoidal target is given here in Hertz (Hz).

References

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Acknowledgments

We are grateful to the Nicotine Science Center at Fertin Pharma A/S for providing the nicotine and placebo gums. We would like to thank Felix Benninghoff-Lühl, Christina Esser, Adrian Pick and Carina Steinberg for their excellent support in data collection.

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Correspondence to Ulrich Ettinger.

Ethics declarations

Approval of the local ethics committee was obtained and the study was conducted in agreement with the latest version of the Code of Ethics of the World Medical Association (Declaration of Helsinki).

Conflict of interest

The authors declare that they have no conflicts of interest.

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Meyhöfer, I., Kasparbauer, AM., Steffens, M. et al. Effects of nicotine on smooth pursuit eye movements in healthy non-smokers. Psychopharmacology 236, 2259–2271 (2019). https://doi.org/10.1007/s00213-019-05223-1

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  • DOI: https://doi.org/10.1007/s00213-019-05223-1

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