Conditioned Freezing
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Effect of the thermal treatment, of the freezing and packing on the storage of organic mango pulp (Mangifera indica L) cv. Ubá / Efeito do tratamento térmico, do congelamento e da embalagem sobre o armazenamento da polpa de manga orgânica (Mangifera indica L) cv. Ubá
The mango stands out as a fruit of high commercial value. Its seasonability favors the industrialization seeking better use and decrease of the production losses. The objective of this work was to compare the time of useful life of the organic Ubá mango pulp, pasteurized, with the organic Ubá mango pulp, frozen, through the quality nutritious, sensorial an
Publicado em: 2006
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14. SYSTEMIC ADMINISTRATION OF POLYAMINERGIC AGENTS MODULATE FEAR CONDITIONING IN RATS. / ADMINISTRAÇÃO SISTÊMICA DE AGENTES POLIAMINÉRGICOS MODULA A MEMÓRIA NA TAREFA DE MEDO CONDICIONADO EM RATOS
The polyamines, spermine, spermidine and putrescine, are a group of aliphatic amines that interact with diverse cellular targets such as nucleic acids and proteins. The polyamines may act as physiological modulators of N-methyl-D-aspartate (NMDA) receptors. The processes mediated by NMDA receptor include synaptic plasticity and formation of neural circuitry
Publicado em: 2006
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15. Neural organization of the mesencephalic system responsible for the freezing behavior. / Organização do sistema neural mesencefálico responsável pela resposta de congelamento.
Freezing to a context previously associated to footshock is attenuated by ventrolateral periaqueductal gray (vlPAG) lesion. Moreover, electrical stimulation or microinfusion of compounds that interfere with GABA neurotransmission in the dorsolateral periaqueductal gray (dlPAG) provoke freezing and escape. The present study examined the possibility of this fr
Publicado em: 2003
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16. Lesions of Periaqueductal Gray Dissociate-Conditioned Freezing From Conditioned Suppression Behavior in Rats
It is commonly assumed that suppression of an ongoing behavior is an indirect measure of freezing behavior. We tested whether conditioned suppression and freezing are the same or distinct conditioned responses. Rats were trained to press a bar for food and then given fear-conditioning sessions in which a tone was paired with a foot shock (two pairings a day
Cold Spring Harbor Laboratory Press.
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17. Nonassociative learning processes determine expression and extinction of conditioned fear in mice
Freezing to a tone following auditory fear conditioning is commonly considered as a measure of the strength of the tone-shock association. The decrease in freezing on repeated nonreinforced tone presentation following conditioning, in turn, is attributed to the formation of an inhibitory association between tone and shock that leads to a suppression of the e
Cold Spring Harbor Laboratory Press.
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18. Lesion of the Ventral Periaqueductal Gray Reduces Conditioned Fear but Does Not Change Freezing Induced by Stimulation of the Dorsal Periaqueductal Gray
Previously-reported evidence showed that freezing to a context previously associated with footshock is impaired by lesion of the ventral periaqueductal gray (vPAG). It has also been shown that stepwise increase in the intensity of the electrical stimulation of the dorsal periaqueductal gray (dPAG) produces alertness, then freezing, and finally escape. These
Cold Spring Harbor Laboratory Press.
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19. Memory for Extinction of Conditioned Fear Is Long-lasting and Persists Following Spontaneous Recovery
Conditioned fear responses to a tone paired with footshock rapidly extinguish when the tone is presented in the absence of the shock. Rather than erase conditioning, extinction is thought to involve the formation of new memory. In support of this, extinguished freezing spontaneously recovers with the passage of time. It is not known, however, how long extinc
Cold Spring Harbor Laboratory Press.
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20. Reciprocal patterns of c-Fos expression in the medial prefrontal cortex and amygdala after extinction and renewal of conditioned fear
After extinction of conditioned fear, memory for the conditioning and extinction experiences becomes context dependent. Fear is suppressed in the extinction context, but renews in other contexts. This study characterizes the neural circuitry underlying the context-dependent retrieval of extinguished fear memories using c-Fos immunohistochemistry. After fear
Cold Spring Harbor Laboratory Press.
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21. Basolateral amygdala is not critical for cognitive memory of contextual fear conditioning
Evidence that lesions of the basolateral amygdala complex (BLC) impair memory for fear conditioning in rats, measured by lack of “freezing” behavior in the presence of cues previously paired with footshocks, has suggested that the BLC may be a critical locus for the memory of fear conditioning. However, evidence that BLC lesions may impair unlearned as w
The National Academy of Sciences.
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22. An egr-1 (zif268) Antisense Oligodeoxynucleotide Infused Into the Amygdala Disrupts Fear Conditioning
Studies of gene expression following fear conditioning have demonstrated that the inducible transcription factor, egr-1, is increased in the lateral nucleus of the amygdala shortly following fear conditioning. These studies suggest that egr-1 and its protein product Egr-1 in the amygdala are important for learning and memory of fear. To directly test this hy
Cold Spring Harbor Laboratory Press.
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23. Intra-Amygdala Muscimol Injections Impair Freezing and Place Avoidance in Aversive Contextual Conditioning
Rats were trained by shocking them in a closed compartment. When subsequently tested in the same closed compartment with no shock, normal rats showed an increased tendency to freeze. They also showed an increased tendency to actively avoid the compartment when given access to an adjacent neutral compartment for the first time. Amygdala inactivation with bila
Cold Spring Harbor Laboratory Press.
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24. Extinction Memory Improvement by the Metabolic Enhancer Methylene Blue
We investigated whether postextinction administration of methylene blue (MB) could enhance retention of an extinguished conditioned response. MB is a redox compound that at low doses elevates cytochrome oxidase activity, thereby improving brain energy production. Saline or MB (4 mg/kg intraperitoneally) were administered to rats for 5 d following extinction
Cold Spring Harbor Laboratory Press.