Pre-receptor profile of sensory images and primary afferent neuronal representation in the mormyrid electrosensory system
| Autor: | Angel A. Caputi, Leonel Gómez, Ruben Budelli, Kirsty Grant |
|---|---|
| Přispěvatelé: | Departamento de Neurociencias Integrativas y Computacionales, University of the Republic, Montevideo, Unité de neurosciences intégratives et computationnelles (UNIC), Centre National de la Recherche Scientifique (CNRS), Institut de Neurobiologie Alfred Fessard (INAF), Facultad de Ciencias, Seccion Biomatematicas, Universidad de la República [Montevideo] (UCUR) |
| Rok vydání: | 2004 |
| Předmět: |
MESH: Microelectrodes
Physiology Action Potentials MESH: Perception 0302 clinical medicine Lateral inhibition Skin Physiological Phenomena MESH: Animals Receptor MESH: Action Potentials Physics Electric Organ 0303 health sciences Gnathonemus MESH: Electrophysiology biology Anatomy Electrophysiology medicine.anatomical_structure Metals [SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC] Plastics Current density Sensory Receptor Cells MESH: Receptors Sensory MESH: Electric Conductivity Sensory system MESH: Plastics Aquatic Science Stimulus (physiology) MESH: Electric Organ MESH: Skin Physiology MESH: Afferent Pathways 03 medical and health sciences medicine Animals Molecular Biology Ecology Evolution Behavior and Systematics 030304 developmental biology Afferent Pathways MESH: Metals Electric Conductivity biology.organism_classification Lobe Receptive field Insect Science MESH: Electric Fish Perception Animal Science and Zoology Microelectrodes Neuroscience 030217 neurology & neurosurgery Electric Fish |
| Zdroj: | Journal of Experimental Biology Journal of Experimental Biology, The Company of Biologists, 2004, 207 (Pt 14), pp.2443-53. ⟨10.1242/jeb.01053⟩ |
| ISSN: | 1477-9145 0022-0949 |
| DOI: | 10.1242/jeb.01053 |
| Popis: | SUMMARY Afferent responses to the fish's own electric organ discharge were explored in the electrosensory lobe of the mormyrid fish Gnathonemus petersii. In order to understand the neural encoding of natural sensory images,responses were examined while objects of different conductivities were placed at different positions along the skin of the fish, i.e. at different points within, and also outside, peripheral receptive fields. The presence of an object in the fish's self-generated electric field produces local modulation of transcutaneous current density. Measurement of the local electric organ discharge shows that object images formed at the electroreceptive sensory surface have an opposing center-surround, `Mexican hat' profile. This is a pre-receptor phenomenon intrinsic to the physical nature of the sensory stimulus that takes place prior to neural lateral inhibition and is independent of such central inhibition. Stimulus intensity is encoded in the latency and number of action potentials in the response of primary afferent fibers. It is also reflected in changes in the amplitude and area of extracellular field potentials recorded in the deep granular layer of the electrosensory lobe. Since the object image consists of a redistribution of current density over the receptive surface,its presence is coded by change in the activity of receptors over an area much larger than the skin surface facing the object. We conclude that each receptor encodes information coming from the whole scene in a manner that may seem ambiguous when seen from a single point and that, in order to extract specific object features, the brain must process the electric image represented over the whole sensory surface. |
| Databáze: | OpenAIRE |
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