Abstract
(1)From the dorsal surface of the toad (Bufo b. spinosus, B. marinus) optic tectum (OT), field potentials (FP) were recorded at 9 reference sites in response to electrical stimulation of the optic nerve (ON). The FP showed 4 main components, besides an initial deflection attributed to axonal potentials: two negative waves N1, N2 (attributed to postsynaptic excitatory processes) and two positive waves P2, P3 (attributed to postsynaptic inhibitory processes). The responses across the reference sites were rather similar in different individuals. (2) Electrical stimulation of an area in the ipsilateral pretectal lateral posterodorsal and posterior (Lpd/P) thalamic region evoked tectal FPs showing mainly a negative and a positive wave. Regarding wave amplitudes, the FPs displayed disproportionalities across the reference sites. (3) Electrical stimulation of the contralateral Lpd/P evoked mainly a positive wave in the tectal FP whose disproportionality corresponded roughly to the one obtained to ipsilateral Lpd/P stimulation. (4) The inital negative wave of the tectal FP in response to ON stimulation was nearly abolished, if Lpd/P stimulation preceded ON stimulation at a delay of 17–25 ms. (5) Since FPs showed adaptation to repetitive stimulation, various experiments were carried out to distinguish adaptation phenomena from effects of neuronal interactions between Lpd/P and OT. (6) The results provide evidence that ON- and Lpd/P-mediated inputs interact in superficial tectal layers, whereby pretectotectal input suppresses retinotectal excitatory information transfer. Input of Lpd/P to the contralateral superficial OT suggests postsynaptic inhibition. This study provides no information about pretectal inputs to deeper tectal layers, which anatomically are known to exist.
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Abbreviations
- A-I :
-
recording sites from the dorsal tectal surface
- D t :
-
delay between Lpd/P and ON stimulation
- EPSP IPSP :
-
excitatory and inhibitory postsynaptic potentials, respectively
- FP :
-
field potential
- L :
-
latency of FP waves
- ON :
-
optic nerve
- OT :
-
optic tectum
- Lpd/P :
-
lateral posterodorsal and posterior pretectal thalamic region
- Lpv :
-
lateral posteroventral pretectal thalamic nucleus
- N, P :
-
negative and positive waves of FPs, respectively
- PRE :
-
presynaptic axonal input
- TH :
-
pretectal thalamic neurons
References
Buxbaum-Conradi H, Ewert J-P (1995) Pretecto-tectal influences I. What the toad's pretectum tells its tectum: an antidromic stimulation/recording study. J Comp Physiol A 176: 169–180
Chung SH, Bliss TVP, Keating MJ (1974) The presynaptic organization of optic afferents in the amphibian tectum. Proc R Soc Lond Bs 187: 421–447
Colmers WF, Lukowiak K, Pittman QJ (1987) Presynaptic action of neuropeptide Y in area CA1 of the rat hippocampal slice. J Physiol (Lond) 383: 285–299
Debski EA, Constantine-Paton M (1990) Evoked pre and post synaptic activity in the optic tectum of the cannulated tadpole. J Comp Physiol A 167: 377–390
Ewert J-P (1968) Der Einfluß von Zwischenhirndefekten auf die Visuomotorik im Beute- und Fluchtverhalten der Erdkröte (Bufo bufo L). Z Vergl Physiol 61: 41–70
Ewert J-P (1971) Single unit response of the toad (Bufo americanus) caudal thalamus to visual objects. Z Vergl Physiol 74: 81–102
Ewert J-P (1987) Neuroethology of releasing mechanisms: prey-catching in toads. Behav Brain Sci 10: 337–405
Ewert J-P (1989) The release of visual behavior in toads: Stages of parallel/hierarchical information processing. In: Ewert J-P, Arbib MA (eds) Visuomotor coordination: amphibians, comparisons, models, and robots. Plenum Press, New York, London, pp 39–120
Ewert J-P, Wietersheim Av (1974a) Musterauswertung durch tectale und thalamus/praetectale Nervennetze im visuellen System der Kröte (Bufo bufo L). J Comp Physiol 92: 131–148
Ewert J-P, Wietersheim Av (1974b) Der Einfluß von Thalamus/Praetectum-Defekten auf die Antwort von TectumNeuronen gegenüber bewegten visuellen Mustern bei der Kröte (Bufo bufo L). J Comp Physiol 92: 149–160
Ewert J-P, Schwippert WW, Beneke TW (1990) Parallel distributed processing of configural moving objects in the toad's visual system. In: Eckmiller R, Hartmann G, Hauske G (eds) Parallel processing in neural systems and computers. North-Holland, Amsterdam New York Oxford Tokyo, pp 109–112
Gernert M, Ewert J-P (1995) Neuropharmacological effects on visually evoked field potentials in the cone toads superficial optic tectum (submitted)
Gruberg ER (1989) Nucleus isthmi and optic tectum in frogs. In: Ewert J-P, Arbib MA (eds) Visuomotor coordination: amphibians, comparisons, models, and robots. Plenum Press, New York London, pp 341–356
Grüsser O-J, Grüsser-Cornehls U (1976) Neurophysiology of the anuran visual system. In: Llinás R, Precht W (eds) Frog neurobiology. Springer, Berlin Heidelberg New York, pp 297–385
Halgren E (1990) Human evoked potentials. In: Boulton AA, Baker GB, Vanderwolf CH (eds) Neuromethods 15, neurophysiological techniques, applications to neural systems. Humana Press, Clifton New Jersey, pp 147–275
Humphrey DR, Schmidt EM (1990) Extracellular single unit recording method. In: Boulton AA, Baker GB, Vanderwolf CH (eds) Neuromethods 15, neurophysiological techniques, Applications to neural systems. Humana Press, Clifton, New Jersey, pp 1–64
Ingle D (1973) Disinhibition of tectal neurons by pretectal lesions in the frog. Science 180: 422–424
Jassik-Gerschenfeld D, Hardy O (1984) The avian optic tectum: Neurophysiology and behavioral correlations. In: Vanegas H (ed) Comparative neurology of the optic tectum. Plenum Press, New York London, pp 649–686
Kozicz T, Lázár G (1994) The origin of tectal NPY immunopositive fibers in the frog. Brain Res 635: 345–348
Kuljis RO, Karten HJ (1982) Laminar organization of peptide-like immunoreactivity in the anuran optic tectum. J Comp Neurol 212: 188–201
Kuljis RO, Karten HJ (1983) Modifications in the laminar organization of peptide-like immunoreactivity in the anuran optic tectum following retinal deafferentation. J Comp Neurol 217: 239–251
Lázár G (1984) Structure and connections of the frog optic tectum. In: Vanegas H (ed) Comparative neurology of the optic tectum. Plenum Press, New York, pp 185–210
Lázár G (1989) Cellular architecture and connectivity of the frog's optic tectum and pretectum. In: Ewert J-P, Arbib MA (eds) Visuomotor coordination: amphibians, comparisons, models, and robots. Plenum Press, New York London, pp 175–199
Leung L-WS (1990) FPs in the central nervous system-recording, analysis, and modeling. In: Boulton AA, Baker GB, Vanderwolf CH (eds) Neuromethods 15, neurophysiological techniques, applications to neural systems. Humana Press, Clifton New Jersey, pp 277–312
Lewis D, Teyler TJ (1986) Long-term potentiation in the goldfish optic tectum. Brain Res 375: 246–250
Matsumoto N (1989) Morphological and physiological studies of tectal and pretectal neurons in the frog. In: Ewert J-P, Arbib MA (eds) Visuomotor coordination: amphibians, comparisons, models, and robots. Plenum Press, New York London, pp 201–222
Matsumoto N, Bando T (1980) Excitatory synaptic potentials and morphological classification of tectal neurons of the frog. Brain Res 192: 39–48
Matsumoto N, Schwippert WW, Ewert J-P (1986) Intracellular activity of morphologically identified neurons of the grass frog's optic tectum in response to moving configurational visual stimuli. J Comp Physiol A 159: 721–739
McCawley EL (1949) Certain actions of curare on the central nervous system. J Pharmacol 97: 129–139
Merchenthaler I, Lázár G, Maderdrut JL (1989) Distribution of proenkephalin-derived peptides in the brain of Rana esculenta. J Comp Neurol 281: 23–39
Neary T, Northcutt RG (1983) Nuclear organization of the bullfrog diencephalon. J Comp Neurol 213: 262–278
Peretz B (1969) Vertical distribution of optic nerve fiber terminations in the frog optic tectum. Am J Physiol 217: 181–187
Sachs L (1984) Angewandte Statistik. Springer, Berlin Heidelberg New York
Scalia F (1976) The optic pathway of the frog: Nuclear organization and connections. In: Llinás R, Precht W (eds) Frog neurobiology. Springer, Berlin Heidelberg New York, pp 386–406
Schwippert WW, Ewert J-P (1994) Effect of neuropeptide-Y on tectal field potentials in the toad. Brain Res (in press)
Sivilotti L, Nistri A (1986) Biphasic effects of glycine on synaptic responses of the frog optic tectum in vitro. Neurosci Lett 66: 25–30
Steinbach JH, Stevens CF (1976) Neuromuscular transmission. In: Llinás R, Precht W (eds) Frog neurobiology. Springer, Berlin Heidelberg New York, pp 33–92
Stevens RJ (1974) A model of an early ‘off’ response in frog optic tectum. Brain Res 67: 51–63
Székely G (1973) Anatomy and synaptology of the optic tectum. In: Jung R (ed) Central processing of visual information, Part B, Visual centers in the brain, (Handbook of sensory physiology, Volume VII/3), Springer, Berlin Heidelberg New York, pp 1–26
Székely G, Lázár G (1976) Cellular and synaptic architecture of the optic tectum. In: Llinás R, Precht W (eds) Frog neurobiology. Springer, Berlin Heidelberg New York, pp 407–434
Vanegas H, Williams B, Essayag E (1984) Electrophysiological and behavioral aspects of the teleostean optic tectum. In: Vanegas H (ed) Comparative neurology of the optic tectum. Plenum Press, New York London, pp 121–161
Wilczynski W, Northcutt RG (1977) Afferents to the optic tectum of the leopard frog: an HRP study. J Comp Neurol 173: 219–229
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Schwippert, W.W., Beneke, T.W. & Ewert, J.P. Pretecto-tectal influences. J Comp Physiol A 176, 181–192 (1995). https://doi.org/10.1007/BF00239921
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DOI: https://doi.org/10.1007/BF00239921