JoVE Logo
Faculty Resource Center

Sign In

Summary

Abstract

Introduction

Protocol

Representative Results

Discussion

Acknowledgements

Materials

References

Neuroscience

Noninvasive EEG Recordings from Freely Moving Piglets

Published: July 13th, 2018

DOI:

10.3791/58226

1Institute of Animal Welfare, Animal Behavior and Laboratory Animal Science, Veterinary Medicine, Free University Berlin, 2Department of Biology, Behavioral Physiology, Humboldt University Berlin, 3Lehr- und Versuchsanstalt für Viehhaltung Hofgut Neumühle

Here, we present a protocol to record telemetric electroencephalograms (EEGs) from freely moving piglets directly in the pigpen without the use of a sedative, making it possible to record typical EEG patterns during non-REM sleep, like spindle bursts.

The method allows the recording of high-quality electroencephalograms (EEGs) from freely moving piglets directly in the pigpen. We use a one-channel telemetric electroencephalography system in combination with standard self-adhesive hydrogel electrodes. The piglets are calmed down without the use of sedatives. After their release into the pigpen, the piglets behave normally—they drink and sleep in the same cycle as their siblings. Their sleep phases are used for the EEG recordings.

Piglets are an emerging model system for neuroscience1. In order to strengthen translational research, we invented a method to record non-invasive, clinical EEGs from unrestrained piglets2 (Figure 1 and Figure 2). Two prerequisites for a translational use of EEG recordings, regarding EEG patterns associated with cortical maturation, are a non-invasive methodology, comparable to the clinical setting, and the abstinence of sedatives or anesthesia. The one-channel telemetry system3 in combination with self-adhesive electrodes can be fixed in....

Log in or to access full content. Learn more about your institution’s access to JoVE content here

All procedures were approved by the local ethics committee (#23177-07/G10-1-010/G 15-15-011) and followed the European and the German national regulations (European Communities Council Directive, 86/609/ECC; Tierschutzgesetz).

All animal procedures were performed in accordance with the Medical Center of the Johannes Gutenberg-University Mainz animal care committee's regulations.

1. Setup

  1. Prior to the experiment, check for any line noise and find an a.......

Log in or to access full content. Learn more about your institution’s access to JoVE content here

We were able to record typical EEG patterns associated with non-REM sleep, like spindle bursts or delta brushes, from freely moving piglets (Figure 1 and Figure 2). We were mostly interested in representative patterns during non-REM sleep, but phases of REM-like sleep12 with a very low amplitude have also been recorded (Figure 3). The physiology and the amount of REM sleep dif.......

Log in or to access full content. Learn more about your institution’s access to JoVE content here

A critical step in the protocol is the adequate skin contact with the electrodes, especially the ground electrode, to achieve stable recordings with low noise. Furthermore, since piglets are very agile, it is important to cover the whole system with silicone rubber to protect the electrodes and the telemetry unit. Furthermore, if the experiments are conducted in a stable with a slatted floor, be cautious with small devices or connectors.

In case of an inadequate grip of the self-adhesive hydro.......

Log in or to access full content. Learn more about your institution’s access to JoVE content here

We would like to thank Helmut Scheu for the opportunity to conduct our research in the pigpen at Hofgut Neumühle.

....

Log in or to access full content. Learn more about your institution’s access to JoVE content here

Name Company Catalog Number Comments
Disposable adhesive
surface silver/silver chloride electrodes
Spes
Medica S.r.l., Genova, Italy
Self adhesive hydrogel electrode
Abralyt HiCl Easycap GmbH Abrasive cream
Body Double fast Smooth On Inc. Skin adhesive silicone
Telemetry system Internal development
Picolog 1216 Pico Technology AD converter
Laptop Panasonic Rugged laptop
Receiver Internal development

  1. Conrad, M. S., Sutton, B. P., Dilger, R. N., Johnson, R. W. An in vivo three-dimensional magnetic resonance imaging-based averaged brain collection of the neonatal piglet (Sus scrofa). PLoS ONE. 9 (9), e107650 (2014).
  2. de Camp, N. V., Hense, F., Lecher, B., Scheu, H., Bergeler, J. Models for preterm cortical development using non invasive clinical EEG. Translational Neuroscience. 8, 211-224 (2017).
  3. Lapray, D., Bergeler, J., Dupont, E., Thews, O., Luhmann, H. J., Barculo, D., Daniels, J. A novel telemetric system for recording brain activity in small animals. Telemetry: Research, Technology and Applications. , 195-203 (2009).
  4. Kim, D., Yeon, C., Kim, K. Development and experimental validation of a dry non- invasive multi-channel mouse scalp EEG sensor through visual evoked potential recordings. Sensors. 17, 326 (2017).
  5. Moshayedi, P., et al. The relationship between glial cell mechanosensitivity and foreign body reactions in the central nervous system. Biomaterials. 35, 3919-3925 (2014).
  6. Barrese, J. C., et al. Failure mode analysis of silicon-based intracortical microelectrode arrays in non-human primates. Journal of Neural Engineering. 10, 066014 (2013).
  7. Hellström-Westas, L., Rosén, I. Electroencephalography and brain damage in preterm infants. Early Human Development. 81, 255-261 (2005).
  8. Lloyd, R. O., Goulding, R. M., Filan, P. M., Boylan, G. B. Overcoming the practical challenges of electroencephalography for very preterm infants in the neonatal intensive care unit. Acta Paediatrica. , 152-157 (2015).
  9. Clancy, B., Finlay, B. L., Darlington, R. B., Anand, K. J. Extrapolating brain development from experimental species to humans. Neurotoxicology. 28, 931-937 (2007).
  10. Iyer, K. K., et al. Cortical burst dynamics predict clinical outcome early in extremely preterm infants. Brain. 138, 2206-2218 (2015).
  11. Luhmann, H., de Camp, N., Bergeler, J. Monitoring brain activity in preterms: mathematics helps to predict clinical outcome. Brain. 138, 2114-2125 (2015).
  12. Dragomir, A., Akay, Y., Curran, A. K., Akay, M. Complexity measures of the central respiratory networks during wakefulness and sleep. Journal of Neural Engineering. 5, 254-261 (2008).
  13. Peever, J., Fuller, P. M. The biology of REM sleep. Current Biology. 27, R1237-R1248 (2017).
  14. Robert, S., Dallaire, A. Polygraphic Analysis of the sleep-wake states and the REM Sleep periodicity in domesticated pigs (Sus scrofa). Physiology & Behavior. 37 (2), 289-293 (1986).

This article has been published

Video Coming Soon

JoVE Logo

Privacy

Terms of Use

Policies

Research

Education

ABOUT JoVE

Copyright © 2024 MyJoVE Corporation. All rights reserved