Somatosensory evoked potentials in the telencephalon of Atlantic salmon (<Emphasis Type="Italic">Salmo salar</Emphasis>) following galvanic stimulation of the tail |
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Authors: | Janicke Nordgreen Tor Einar Horsberg Birgit Ranheim Andrew C N Chen |
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Institution: | (1) Department of Pharmacology and Toxicology, Norwegian School of Veterinary Science, PO Box 8146 Dep, 0033 Oslo, Norway;(2) Center for Higher Brain Functions, Capital Medical University, No.10 Xitoutiao, You An Men, Beijing, 100054, People’s Republic of China |
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Abstract: | Electric activity in the brain which is time-locked to a given stimulation of the somatosensory system can be recorded as
a somatosensory evoked potential (SEP). We investigated whether a galvanic stimulation of the tail base in Atlantic salmon
(Salmo salar) would elicit a SEP in the telencephalon. The telencephalon is central in learning and memory, and activity here may be a
prerequisite for processing of external stimuli on a cognitive or emotional level. Anaesthetized salmon (n = 11) were subjected to craniotomy and a recording electrode was inserted into the telencephalon. The fish were given stimulations
of four intensities, i.e., 2, 5, 10 and 20 mA. A SEP was elicited in the contralateral dorsal telencephalon for all intensities.
This result agrees with findings in other fish species. Furthermore, there was a significant difference between the maximum
peak amplitude and mean amplitude of the SEP elicited by putative non-noxious (2 mA) and putative noxious (20 mA) stimulation
intensities (P < 0.01). The stronger stimulation intensities also tend to introduce longer-latencies components in the SEP. The results
added to the body of literature indicates that the exteroceptive senses are represented by processing within the telencephalon
of the fish. |
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Keywords: | Nociception Pain SEP Salmon Teleost |
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