Abstract
The electrical activity from the brain of vertebrates and some mollusks (octopus and cuttlefish; Bullock 1984) is dominated by slow components in the range 0 to 30 Hz and fast events such as spikes are seen by special effort. In contrast, electrical activity from the brain of several invertebrates such as crayfish, earthorm, slug and grasshopper, is dominated by spikes (Bullock 1945, Bullock and Horridge 1965, Bullock and Basar 1988), with relatively weak components of the power spectrum from around 5 Hz to 50 Hz. These differences in brain signals from vertebrates and invertebrates are not explained by brain size, different electrodes or other obvious factors, and they might depend on the different anatomical arrangements of neurons and their processes and neuroglia or on a relative weakness of synchrony in most invertebrates.
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Ramón, F., Hernández-Falcón, J., Bullock, T.H. (2002). Brain Electrical Signals in Unrestrained Crayfish. In: Escobar-Briones, E., Alvarez, F. (eds) Modern Approaches to the Study of Crustacea. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0761-1_2
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DOI: https://doi.org/10.1007/978-1-4615-0761-1_2
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