Conditioned facilitatory modulation of the response to an aversive stimulus in the crab Chasmagnathus
A mild electrical shock delivered to the walking legs of the crab Chasmagnathus granulatus through a fine layer of sea water, induces a running response that declines after repeated stimulation. Herein, a first series of experiments was aimed at conditioning the response to a light or a dark pulse,...
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1992
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319384_v51_n1_p17_Hermitte http://hdl.handle.net/20.500.12110/paper_00319384_v51_n1_p17_Hermitte |
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paper:paper_00319384_v51_n1_p17_Hermitte2023-06-08T14:59:03Z Conditioned facilitatory modulation of the response to an aversive stimulus in the crab Chasmagnathus Hermitte, Gabriela Conditioned fear Conditioned modulatory Crustacea Habituation Pavlovian conditioning animal experiment article conditioning controlled study crab habituation learning male nonhuman priority journal Animal Arousal Association Learning Avoidance Learning Brachyura Conditioning, Classical Electroshock Escape Reaction Habituation (Psychophysiology) Mental Recall Nervous System Physiology Photic Stimulation Receptors, Opioid Support, Non-U.S. Gov't A mild electrical shock delivered to the walking legs of the crab Chasmagnathus granulatus through a fine layer of sea water, induces a running response that declines after repeated stimulation. Herein, a first series of experiments was aimed at conditioning the response to a light or a dark pulse, but no detectable CR was disclosed during training nor in a later test with the CS alone, even though several stimulus parameters were assayed. In a second series, crabs were repeatedly exposed during training to a light pulse (CS) immediately followed by shock (UCS), and after a 6-h rest interval, tested with either CS-UCS or UCS. The CS-UCS presentation at testing elicited a higher recovery (potentiated recovery, circa 70%) than that evoked by the UCS alone (unconditioned recovery, circa 35%) (Experiment 3). An experiment including the explicity unpaired control procedure (Experiment 4), confirmed that the enhanced response (CR) to the shock (UCS) (measured as potentiated recovery) is conditioned to an illumination signal (CS). An alternative explanation of the potentiated recovery in terms of retardation of habituation proved hardly tenable (Experiment 5). In Experiment 6, crabs were exposed to a variety of light pulse shock and dark pulse shock temporal relationships, and results were found consistent with a delay of reinforcement gradient when light termination was considered as CS. Thus a decrease in luminance is able to become associated with shock and to condition an enhanced response regardless of light termination being the offset of a light pulse or the onset of a dark pulse. Accordingly, potentiated recovery was shown when the shock at test trial was immediately preceded both by a short light pulse and by the end of a long period of illumination (Experiment 7). © 1991. Fil:Hermitte, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1992 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319384_v51_n1_p17_Hermitte http://hdl.handle.net/20.500.12110/paper_00319384_v51_n1_p17_Hermitte |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Conditioned fear Conditioned modulatory Crustacea Habituation Pavlovian conditioning animal experiment article conditioning controlled study crab habituation learning male nonhuman priority journal Animal Arousal Association Learning Avoidance Learning Brachyura Conditioning, Classical Electroshock Escape Reaction Habituation (Psychophysiology) Mental Recall Nervous System Physiology Photic Stimulation Receptors, Opioid Support, Non-U.S. Gov't |
| spellingShingle |
Conditioned fear Conditioned modulatory Crustacea Habituation Pavlovian conditioning animal experiment article conditioning controlled study crab habituation learning male nonhuman priority journal Animal Arousal Association Learning Avoidance Learning Brachyura Conditioning, Classical Electroshock Escape Reaction Habituation (Psychophysiology) Mental Recall Nervous System Physiology Photic Stimulation Receptors, Opioid Support, Non-U.S. Gov't Hermitte, Gabriela Conditioned facilitatory modulation of the response to an aversive stimulus in the crab Chasmagnathus |
| topic_facet |
Conditioned fear Conditioned modulatory Crustacea Habituation Pavlovian conditioning animal experiment article conditioning controlled study crab habituation learning male nonhuman priority journal Animal Arousal Association Learning Avoidance Learning Brachyura Conditioning, Classical Electroshock Escape Reaction Habituation (Psychophysiology) Mental Recall Nervous System Physiology Photic Stimulation Receptors, Opioid Support, Non-U.S. Gov't |
| description |
A mild electrical shock delivered to the walking legs of the crab Chasmagnathus granulatus through a fine layer of sea water, induces a running response that declines after repeated stimulation. Herein, a first series of experiments was aimed at conditioning the response to a light or a dark pulse, but no detectable CR was disclosed during training nor in a later test with the CS alone, even though several stimulus parameters were assayed. In a second series, crabs were repeatedly exposed during training to a light pulse (CS) immediately followed by shock (UCS), and after a 6-h rest interval, tested with either CS-UCS or UCS. The CS-UCS presentation at testing elicited a higher recovery (potentiated recovery, circa 70%) than that evoked by the UCS alone (unconditioned recovery, circa 35%) (Experiment 3). An experiment including the explicity unpaired control procedure (Experiment 4), confirmed that the enhanced response (CR) to the shock (UCS) (measured as potentiated recovery) is conditioned to an illumination signal (CS). An alternative explanation of the potentiated recovery in terms of retardation of habituation proved hardly tenable (Experiment 5). In Experiment 6, crabs were exposed to a variety of light pulse shock and dark pulse shock temporal relationships, and results were found consistent with a delay of reinforcement gradient when light termination was considered as CS. Thus a decrease in luminance is able to become associated with shock and to condition an enhanced response regardless of light termination being the offset of a light pulse or the onset of a dark pulse. Accordingly, potentiated recovery was shown when the shock at test trial was immediately preceded both by a short light pulse and by the end of a long period of illumination (Experiment 7). © 1991. |
| author |
Hermitte, Gabriela |
| author_facet |
Hermitte, Gabriela |
| author_sort |
Hermitte, Gabriela |
| title |
Conditioned facilitatory modulation of the response to an aversive stimulus in the crab Chasmagnathus |
| title_short |
Conditioned facilitatory modulation of the response to an aversive stimulus in the crab Chasmagnathus |
| title_full |
Conditioned facilitatory modulation of the response to an aversive stimulus in the crab Chasmagnathus |
| title_fullStr |
Conditioned facilitatory modulation of the response to an aversive stimulus in the crab Chasmagnathus |
| title_full_unstemmed |
Conditioned facilitatory modulation of the response to an aversive stimulus in the crab Chasmagnathus |
| title_sort |
conditioned facilitatory modulation of the response to an aversive stimulus in the crab chasmagnathus |
| publishDate |
1992 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319384_v51_n1_p17_Hermitte http://hdl.handle.net/20.500.12110/paper_00319384_v51_n1_p17_Hermitte |
| work_keys_str_mv |
AT hermittegabriela conditionedfacilitatorymodulationoftheresponsetoanaversivestimulusinthecrabchasmagnathus |
| _version_ |
1768546290663161856 |