Domestic chicks will normally peck readily at small colored beads. However, a peck at a bead with an unpleasant taste usually results in a long-lasting aversion to beads of that type. If prior experience ("pretraining") of a bead of the type that is to be used in a later aversive training trial is given to testosterone-treated chicks, it interferes with the retention of avoidance. Interference by pretraining is effective only within sharply defined periods of time: when the pretraining-training interval is either less than 2 min (short term) or greater than about 25 min (long term). When pretraining and training are separated by 90 min or more, the steroid can be effective when injected up to 30 min after pretraining. It appears to change the character of the consolidating memory trace of pretraining in such a way as to make the consolidating memory trace of pretraining in such a way as to make the consolidation of later, contradictory information from training loss likely. The initial storage of this information is apparently unaffected, since retention does not begin to decay until 30-60 min after training. Sort-term interference leads to loss of avoidance within 5 min of training and can be used to demonstrate that the latency of action of the hormone in this task is less than 20 min following a subcutaneous injection.
{"title":"Limited period of actin of testosterone on memory formation in the chick.","authors":"P G Clifton, R J Andrew, M E Gibbs","doi":"10.1037/h0077883","DOIUrl":"https://doi.org/10.1037/h0077883","url":null,"abstract":"<p><p>Domestic chicks will normally peck readily at small colored beads. However, a peck at a bead with an unpleasant taste usually results in a long-lasting aversion to beads of that type. If prior experience (\"pretraining\") of a bead of the type that is to be used in a later aversive training trial is given to testosterone-treated chicks, it interferes with the retention of avoidance. Interference by pretraining is effective only within sharply defined periods of time: when the pretraining-training interval is either less than 2 min (short term) or greater than about 25 min (long term). When pretraining and training are separated by 90 min or more, the steroid can be effective when injected up to 30 min after pretraining. It appears to change the character of the consolidating memory trace of pretraining in such a way as to make the consolidating memory trace of pretraining in such a way as to make the consolidation of later, contradictory information from training loss likely. The initial storage of this information is apparently unaffected, since retention does not begin to decay until 30-60 min after training. Sort-term interference leads to loss of avoidance within 5 min of training and can be used to demonstrate that the latency of action of the hormone in this task is less than 20 min following a subcutaneous injection.</p>","PeriodicalId":15394,"journal":{"name":"Journal of comparative and physiological psychology","volume":"96 2","pages":"212-22"},"PeriodicalIF":0.0,"publicationDate":"1982-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1037/h0077883","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18114678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The effects of various neurotransmitter antagonists on suckling behavior of 3- and 4-day-old Sprague-Dawley rat pups were examined. Peripheral administration of three serotonergic antagonist, scopolamine, were observed to markedly reduce suckling behavior of neonatal rat pups. These effects appear to be centrally mediated since intracisternal administration of small doses of all of these drugs was observed to suppress suckling. The reduction in suckling induced by these antagonists did not appear to be a result of a debilitating effect of the drugs or to be due to any alteration in body temperature. In contrast, the opiate antagonist naloxone, the dopaminergic antagonist haloperidol, the alpha-noradrenergic antagonist phentolamine, and the beta-noradrenergi antagonist propranolol did not consistently produce any alteration in suckling behavior. These results suggest that the serotonergic and cholinergic systems may be functioning much earlier in ontogeny than previously suggested and may be involved in modulating suckling behavior in the early neonatal period.
{"title":"Suckling behavior in neonatal rats: psychopharmacological investigations.","authors":"L P Spear, L A Ristine","doi":"10.1037/h0077884","DOIUrl":"https://doi.org/10.1037/h0077884","url":null,"abstract":"<p><p>The effects of various neurotransmitter antagonists on suckling behavior of 3- and 4-day-old Sprague-Dawley rat pups were examined. Peripheral administration of three serotonergic antagonist, scopolamine, were observed to markedly reduce suckling behavior of neonatal rat pups. These effects appear to be centrally mediated since intracisternal administration of small doses of all of these drugs was observed to suppress suckling. The reduction in suckling induced by these antagonists did not appear to be a result of a debilitating effect of the drugs or to be due to any alteration in body temperature. In contrast, the opiate antagonist naloxone, the dopaminergic antagonist haloperidol, the alpha-noradrenergic antagonist phentolamine, and the beta-noradrenergi antagonist propranolol did not consistently produce any alteration in suckling behavior. These results suggest that the serotonergic and cholinergic systems may be functioning much earlier in ontogeny than previously suggested and may be involved in modulating suckling behavior in the early neonatal period.</p>","PeriodicalId":15394,"journal":{"name":"Journal of comparative and physiological psychology","volume":"96 2","pages":"244-55"},"PeriodicalIF":0.0,"publicationDate":"1982-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1037/h0077884","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17188611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study was undertaken to investigate the intricate relations between prelaying nest-building activity and preovulatory hormonal changes, and the effects of these events on breeding success. Pairs of ring doves were allowed to go through a complete breeding cycle under four conditions of nest-building opportunity. Nest were self-made, pre-made, pre-made and covered, or removed daily to generate various levels of building activity. Behavioral and hormonal changes were observed throughout the cycle. Blood levels of gonadotrophins were monitored by daily measurements with the method or radioimmunoassay. A depression of follicle-stimulating hormone (FSH) typically was associated with every preovulatory surge of luteinizing hormone (LH); an LH surge not accompanied by a FSH dip was not followed by ovulation. Moreover, the FSH depression was significantly correlated with the level of nest-building activity. These findings led to the proposal that nest-building activity stimulated preovulatory FSH change and, hence, ovulation. The constructed nest in turn appeared to promote incubation behavior. These results are discussed in the context of breeding success.
{"title":"The role of nest-building activity of gonadotrophin secretions and the reproductive success of ring doves (Streptopelia risoria).","authors":"M F Cheng, J Balthazart","doi":"10.1037/h0077875","DOIUrl":"https://doi.org/10.1037/h0077875","url":null,"abstract":"<p><p>This study was undertaken to investigate the intricate relations between prelaying nest-building activity and preovulatory hormonal changes, and the effects of these events on breeding success. Pairs of ring doves were allowed to go through a complete breeding cycle under four conditions of nest-building opportunity. Nest were self-made, pre-made, pre-made and covered, or removed daily to generate various levels of building activity. Behavioral and hormonal changes were observed throughout the cycle. Blood levels of gonadotrophins were monitored by daily measurements with the method or radioimmunoassay. A depression of follicle-stimulating hormone (FSH) typically was associated with every preovulatory surge of luteinizing hormone (LH); an LH surge not accompanied by a FSH dip was not followed by ovulation. Moreover, the FSH depression was significantly correlated with the level of nest-building activity. These findings led to the proposal that nest-building activity stimulated preovulatory FSH change and, hence, ovulation. The constructed nest in turn appeared to promote incubation behavior. These results are discussed in the context of breeding success.</p>","PeriodicalId":15394,"journal":{"name":"Journal of comparative and physiological psychology","volume":"96 2","pages":"307-24"},"PeriodicalIF":0.0,"publicationDate":"1982-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1037/h0077875","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17854948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J E Steinmetz, A L Beggs, J Cervenka, A G Romano, M M Patterson
Temporal parameters concerning retention of a stimulation-induced hindlimb flexion were investigated. After spinal transection, 60 rats received 10, 20, 30, 40, 45, or 50 min of hindlimb stimulation. Consistent persistence of flexion following stimulus cessation was observed in rats that were stimulated for at least 30 min. When the results ae compared with previous data, the spinalized rat shows a 10-min reduction in the critical time interval needed to consistently obtain poststimulation persistence of flexion.
{"title":"Temporal parameters involved in retention of reflex alterations in spinal rats.","authors":"J E Steinmetz, A L Beggs, J Cervenka, A G Romano, M M Patterson","doi":"10.1037/h0077881","DOIUrl":"https://doi.org/10.1037/h0077881","url":null,"abstract":"<p><p>Temporal parameters concerning retention of a stimulation-induced hindlimb flexion were investigated. After spinal transection, 60 rats received 10, 20, 30, 40, 45, or 50 min of hindlimb stimulation. Consistent persistence of flexion following stimulus cessation was observed in rats that were stimulated for at least 30 min. When the results ae compared with previous data, the spinalized rat shows a 10-min reduction in the critical time interval needed to consistently obtain poststimulation persistence of flexion.</p>","PeriodicalId":15394,"journal":{"name":"Journal of comparative and physiological psychology","volume":"96 2","pages":"325-7"},"PeriodicalIF":0.0,"publicationDate":"1982-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1037/h0077881","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18114681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Developmental changes in the golden hamster pup's capacity for behavioral temperature regulation were studied. Groups of three pups aged 4-14 days were tested at room temperature (22 degrees C), on a strong gradient (34-22 degrees C), and on a mild gradient (30-22 degrees C). The proportion of time engaged in the following behaviors was recorded: contact with the warm edge (thermotaxis), active huddling, and quiet huddling. Pups tested at 22 degrees C engaged in active huddling, and their temperature dropped rapidly. Only on Day 14 were they able to maintain their temperature constant with a combination of vigorous exploration and quiet huddling. On the strong gradient, by contrast, pups were able to regulate their temperature at all ages. Young pups (4-5 days) depended on thermotaxis rather than huddling, separating when their temperature started to rise. With age, quiet huddling replaced thermotaxis as a dominant behavior. On the mild gradient, pups combined active and quiet huddling with thermotaxis, so that their temperature dropped at al slow steady rate (.1 degrees C/min). It is concluded that hamster pups have a well-developed capacity for behavioral temperature regulation. Whether they attempt to keep their temperature constant or tolerate a slow rate of drop depends on the amount of exogenous heat available, which under natural conditions would be supplied predominantly by the mother. These results suggest that the pups as well as the mother may participate in thermal regulation in the nest.
{"title":"Shifting strategies for behavioral thermoregulation in developing golden hamsters.","authors":"C M Leonard","doi":"10.1037/h0077876","DOIUrl":"https://doi.org/10.1037/h0077876","url":null,"abstract":"<p><p>Developmental changes in the golden hamster pup's capacity for behavioral temperature regulation were studied. Groups of three pups aged 4-14 days were tested at room temperature (22 degrees C), on a strong gradient (34-22 degrees C), and on a mild gradient (30-22 degrees C). The proportion of time engaged in the following behaviors was recorded: contact with the warm edge (thermotaxis), active huddling, and quiet huddling. Pups tested at 22 degrees C engaged in active huddling, and their temperature dropped rapidly. Only on Day 14 were they able to maintain their temperature constant with a combination of vigorous exploration and quiet huddling. On the strong gradient, by contrast, pups were able to regulate their temperature at all ages. Young pups (4-5 days) depended on thermotaxis rather than huddling, separating when their temperature started to rise. With age, quiet huddling replaced thermotaxis as a dominant behavior. On the mild gradient, pups combined active and quiet huddling with thermotaxis, so that their temperature dropped at al slow steady rate (.1 degrees C/min). It is concluded that hamster pups have a well-developed capacity for behavioral temperature regulation. Whether they attempt to keep their temperature constant or tolerate a slow rate of drop depends on the amount of exogenous heat available, which under natural conditions would be supplied predominantly by the mother. These results suggest that the pups as well as the mother may participate in thermal regulation in the nest.</p>","PeriodicalId":15394,"journal":{"name":"Journal of comparative and physiological psychology","volume":"96 2","pages":"234-43"},"PeriodicalIF":0.0,"publicationDate":"1982-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1037/h0077876","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18114680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Histamine elicited drinking in a dose-related manner typically within 5 min after subcutaneous injection in male albino rats. Threshold for increased drinking was 1.25 mg/kg, and 2.5 mg/kg elicited half of the maximal drinking response that followed 20 mg/kg. Histamine was not differentially potent for drinking in the day or night phase of the diurnal cycle. Bilateral subdiaphragmatic vagotomy, with the hepatic branch left intact, severely attenuated drinking in response to systemic histamine: Vagotomized rats drank later and less than did normal rats after doses of histamine between 1.25 and 40 mg/kg. This attenuation was attributed to the destruction of vagal afferent fibers because histamine-elicited drinking was not affected by blockade of vagal efferents with the peripheral anticholinergic atropine methyl nitrate. Drugs antagonistic to peripheral H2 histamine receptors specifically inhibited drinking in response to histamine: Intraperitoneal cimetidine or metiamide delayed and decreased drinking after sc histamine and temporarily decreased drinking after hypovolemia produced by sc polyethylene glycol, but these H2 antagonists failed to inhibit drinking after water deprivation, cellular dehydration, or isoproterenol. Finally, cimetidine or metiamide inhibited drinking in temporal association with a meal of liquid or solid food without decreasing food intake. These results constitute the first evidence for a peripheral histaminergic determinant of food-related drinking in the rat.
{"title":"A vagally mediated histaminergic component of food-related drinking in the rat.","authors":"F S Kraly, K R June","doi":"10.1037/h0077863","DOIUrl":"https://doi.org/10.1037/h0077863","url":null,"abstract":"<p><p>Histamine elicited drinking in a dose-related manner typically within 5 min after subcutaneous injection in male albino rats. Threshold for increased drinking was 1.25 mg/kg, and 2.5 mg/kg elicited half of the maximal drinking response that followed 20 mg/kg. Histamine was not differentially potent for drinking in the day or night phase of the diurnal cycle. Bilateral subdiaphragmatic vagotomy, with the hepatic branch left intact, severely attenuated drinking in response to systemic histamine: Vagotomized rats drank later and less than did normal rats after doses of histamine between 1.25 and 40 mg/kg. This attenuation was attributed to the destruction of vagal afferent fibers because histamine-elicited drinking was not affected by blockade of vagal efferents with the peripheral anticholinergic atropine methyl nitrate. Drugs antagonistic to peripheral H2 histamine receptors specifically inhibited drinking in response to histamine: Intraperitoneal cimetidine or metiamide delayed and decreased drinking after sc histamine and temporarily decreased drinking after hypovolemia produced by sc polyethylene glycol, but these H2 antagonists failed to inhibit drinking after water deprivation, cellular dehydration, or isoproterenol. Finally, cimetidine or metiamide inhibited drinking in temporal association with a meal of liquid or solid food without decreasing food intake. These results constitute the first evidence for a peripheral histaminergic determinant of food-related drinking in the rat.</p>","PeriodicalId":15394,"journal":{"name":"Journal of comparative and physiological psychology","volume":"96 1","pages":"89-104"},"PeriodicalIF":0.0,"publicationDate":"1982-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1037/h0077863","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18103458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to determine the importance of reduced and aromatized metabolites of testosterone for male sexual behavior in Peromyscus maniculatus bairdi, castrated males were treated with 5 alpha-reductase and aromatase inhibitors. In the first experiment, testosterone propionate (TP) activation of male copulatory behavior was blocked by the administration of the 5 alpha-reductase inhibitor 4-androsten-3-one-17-beta carboxylic acid (17 beta C). These treatments also prevented TP stimulation of seminal vesicles and ventral prostate gland weight. The inhibitory effects of 17 beta C were specific to testosterone, since 17 beta C did not prevent dihydrotestosterone propionate (DHTP) induction of male sexual behavior or seminal vesicles and ventral prostate gland weight increases. In the second experiment, TP activation of male copulatory behavior was prevented by the administration of the aromatase inhibitor 1,4,6-androstatriene-3,17-dione (ATD). The ATD did not interfere with DHTP activation of male reproductive behavior. Also, TP and DHTP stimulation of accessory sex organ weight was not blocked by ATD. On the basis of these data, it is suggested that metabolism of testosterone to both 5 alpha-reduced androgens and estrogens is obligatory for testosterone to reliably stimulate male sexual behavior in castrated male deer mice.
{"title":"Testosterone acts as a prohormone to stimulate male copulatory behavior in male deer mice (peromyscus maniculatus bairdi).","authors":"L G Clemens, S M Pomerantz","doi":"10.1037/h0077859","DOIUrl":"https://doi.org/10.1037/h0077859","url":null,"abstract":"<p><p>In order to determine the importance of reduced and aromatized metabolites of testosterone for male sexual behavior in Peromyscus maniculatus bairdi, castrated males were treated with 5 alpha-reductase and aromatase inhibitors. In the first experiment, testosterone propionate (TP) activation of male copulatory behavior was blocked by the administration of the 5 alpha-reductase inhibitor 4-androsten-3-one-17-beta carboxylic acid (17 beta C). These treatments also prevented TP stimulation of seminal vesicles and ventral prostate gland weight. The inhibitory effects of 17 beta C were specific to testosterone, since 17 beta C did not prevent dihydrotestosterone propionate (DHTP) induction of male sexual behavior or seminal vesicles and ventral prostate gland weight increases. In the second experiment, TP activation of male copulatory behavior was prevented by the administration of the aromatase inhibitor 1,4,6-androstatriene-3,17-dione (ATD). The ATD did not interfere with DHTP activation of male reproductive behavior. Also, TP and DHTP stimulation of accessory sex organ weight was not blocked by ATD. On the basis of these data, it is suggested that metabolism of testosterone to both 5 alpha-reduced androgens and estrogens is obligatory for testosterone to reliably stimulate male sexual behavior in castrated male deer mice.</p>","PeriodicalId":15394,"journal":{"name":"Journal of comparative and physiological psychology","volume":"96 1","pages":"114-22"},"PeriodicalIF":0.0,"publicationDate":"1982-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1037/h0077859","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18103511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Previous research has found that maternal rats discriminate male from female offspring and provide more anogenital licking to males. Two experiments were performed to determine whether this discrimination is based on hormonal condition of young. It was found that 500 micrograms of testosterone, estradiol, or dihydrotestosterone injected on the day of birth into female pups led to their receiving an equivalent amount of maternal anogenital licking as males and significantly more than either oil or untreated females. The different steroids had similar effects. Maternal nonanogenital licking was not affected by sex or hormonal condition of pups, but it was significantly increased by injection per se. Effects on maternal behavior of hormonal condition or neonatal injection of young were apparent 1 and 9 days after injection.
{"title":"Maternal behavior of rats is affected by hormonal condition of pups.","authors":"C L Moore","doi":"10.1037/h0077866","DOIUrl":"https://doi.org/10.1037/h0077866","url":null,"abstract":"<p><p>Previous research has found that maternal rats discriminate male from female offspring and provide more anogenital licking to males. Two experiments were performed to determine whether this discrimination is based on hormonal condition of young. It was found that 500 micrograms of testosterone, estradiol, or dihydrotestosterone injected on the day of birth into female pups led to their receiving an equivalent amount of maternal anogenital licking as males and significantly more than either oil or untreated females. The different steroids had similar effects. Maternal nonanogenital licking was not affected by sex or hormonal condition of pups, but it was significantly increased by injection per se. Effects on maternal behavior of hormonal condition or neonatal injection of young were apparent 1 and 9 days after injection.</p>","PeriodicalId":15394,"journal":{"name":"Journal of comparative and physiological psychology","volume":"96 1","pages":"123-9"},"PeriodicalIF":0.0,"publicationDate":"1982-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1037/h0077866","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18103512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elevations in the concentration of plasma angiotensin II (AII) and decline in plasma aldosterone (Ald) were noted in African Green monkeys at 48 hr of water deprivation but not subsequent to an equivalent duration of food deprivation, compared with nondeprived levels. In a second experiment, drinking was initiated following treatment with AII, hypertonic saline, and the beta-adrenergic stimulator isoproterenol. Concomitant elevations in plasma AII concentrations were measured following isoproterenol injection, but not after AII or hypertonic saline injection, when compared with isotonic saline treatment. Elevations in plasma Ald levels were noted following AII injection. A third experiment evaluated dipsogenic additivity of stimuli by comparing the volumes of water consumed following isoproterenol or hypertonic saline injection with the intake resulting from combined treatment with isoproterenol and hypertonic saline. Additivity was tested under ad lib conditions and following adaptation to a daily water deprivation regimen. The results of the first two experiments generally agree with predictions based on the respective contributions by intracellular dehydration and extracellular fluid volume depletion, to thirst. However, additivity of thirst stimuli was not demonstrated in the third experiment.
{"title":"An evaluation of dipsogenic stimuli in the African green monkey.","authors":"J W Wright, E M Schulz, J W Harding","doi":"10.1037/h0077867","DOIUrl":"https://doi.org/10.1037/h0077867","url":null,"abstract":"<p><p>Elevations in the concentration of plasma angiotensin II (AII) and decline in plasma aldosterone (Ald) were noted in African Green monkeys at 48 hr of water deprivation but not subsequent to an equivalent duration of food deprivation, compared with nondeprived levels. In a second experiment, drinking was initiated following treatment with AII, hypertonic saline, and the beta-adrenergic stimulator isoproterenol. Concomitant elevations in plasma AII concentrations were measured following isoproterenol injection, but not after AII or hypertonic saline injection, when compared with isotonic saline treatment. Elevations in plasma Ald levels were noted following AII injection. A third experiment evaluated dipsogenic additivity of stimuli by comparing the volumes of water consumed following isoproterenol or hypertonic saline injection with the intake resulting from combined treatment with isoproterenol and hypertonic saline. Additivity was tested under ad lib conditions and following adaptation to a daily water deprivation regimen. The results of the first two experiments generally agree with predictions based on the respective contributions by intracellular dehydration and extracellular fluid volume depletion, to thirst. However, additivity of thirst stimuli was not demonstrated in the third experiment.</p>","PeriodicalId":15394,"journal":{"name":"Journal of comparative and physiological psychology","volume":"96 1","pages":"78-88"},"PeriodicalIF":0.0,"publicationDate":"1982-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1037/h0077867","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18083427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rats with lesions severing either the subcallosal fornix (Fo) or the medial half of the fimbria (Fi) were used. They were compared with control (Co) animals in a working memory task (serial alternation) and a reference memory task (cue-guided alternation). Neither task required spatial mapping strategy. Damaging the Fi, but not the Fo, caused a severe deficit in the serial alternation task. Analysis of individual performance revealed that Fi rats either adopted a "side strategy, " resulting in worse than chance performance. This active perseveration required intact working memory mechanism. In the cue-guided alternation task, Fo animals proved superior to Co and Fi rats. These findings are inconsistent with notions that the exclusive role of the hippocampus is spatial mapping or storing of recent memories. They indicate also differential involvement of the fimbria and fornix fibers in behavior.
{"title":"Spatial mapping, working memory, and the fimbria-fornix system.","authors":"G Buzsáki, L Bors, F Nagy, E Eidelberg","doi":"10.1037/h0077862","DOIUrl":"https://doi.org/10.1037/h0077862","url":null,"abstract":"<p><p>Rats with lesions severing either the subcallosal fornix (Fo) or the medial half of the fimbria (Fi) were used. They were compared with control (Co) animals in a working memory task (serial alternation) and a reference memory task (cue-guided alternation). Neither task required spatial mapping strategy. Damaging the Fi, but not the Fo, caused a severe deficit in the serial alternation task. Analysis of individual performance revealed that Fi rats either adopted a \"side strategy, \" resulting in worse than chance performance. This active perseveration required intact working memory mechanism. In the cue-guided alternation task, Fo animals proved superior to Co and Fi rats. These findings are inconsistent with notions that the exclusive role of the hippocampus is spatial mapping or storing of recent memories. They indicate also differential involvement of the fimbria and fornix fibers in behavior.</p>","PeriodicalId":15394,"journal":{"name":"Journal of comparative and physiological psychology","volume":"96 1","pages":"26-34"},"PeriodicalIF":0.0,"publicationDate":"1982-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1037/h0077862","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18103453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}