Persona:
Pellón Suárez de Puga, Ricardo

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0000-0002-4099-7621
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Pellón Suárez de Puga
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Ricardo
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Autor: Fuentes Verdugo, Esmeralda × search.filters.applied.f.itemDepartamento: Psicología Básica I ×

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Mostrando 1 - 2 de 2
  • Miniatura
    Publicación
    Environmental enrichment accelerates the acquisition of schedule-induced drinking in rats
    (Elsevier, 2023-09-15) Fuentes Verdugo, Esmeralda; López Tolsa Gómez, Gabriela Eugenia; García Pascual, Raquel; Pellón Suárez de Puga, Ricardo
    Environmental enrichment (EE) provides an improvement in the housing conditions of experimental animals, such as laboratory rats, with greater physical and social stimulation through toys and company in the home cages. Its use is known to influence performance of experimental protocols, but these effects have not been well determined in the schedule-induced drinking (SID) procedure. The main goal of this study was to investigate the effects of EE on the acquisition of SID in 24 12-week-old male Wistar rats, divided into two groups, a group with EE housed with toys and companions, and a group without enrichment in individual housing conditions without toys (social isolation and no environmental enrichment, INEE). A total of 25 sessions, under a fixed time 30 s food reinforcement schedule and with access to water in the experimental chambers were carried out. Sessions lasted 30 min. The results showed that the EE group developed faster the excessive drinking pattern of SID, and drank to higher levels, than the INEE group. The greater development of SID in the EE group contradicts the view of schedule-induced behavior as linked to stress reduction and better suits with the conception of induction related to positive reinforcement.
  • Miniatura
    Publicación
    Physical activity reduces alcohol consumption induced by reward downshift
    (American Psychological Association, 2023) Castejón, Elena; Fuentes Verdugo, Esmeralda; Torres, Carmen; Pellón Suárez de Puga, Ricardo
    Increased voluntary consumption of alcohol and other anxiolytics has been demonstrated in animals after experiencing frustrative reward devaluation (downshift) or omission. These results have been interpreted in terms of emotional self-medication. In the present study, we analyzed whether voluntary physical activity reduces alcohol intake induced by reward downshift. Sixty-four male Wistar rats were divided into eight groups (n = 8). Thirty-two (downshifted) animals received 32% sucrose during 10 preshift sessions (5 min), followed by 4% sucrose during five postshift sessions, whereas 32 (unshifted) controls were always exposed to 4% sucrose. Immediately after each consummatory session, animals were exposed to a 2-hr two-bottle preference test involving 32% alcohol versus water or water versus water. Half of the animals had also access to a wheel for voluntary running during the preference test. The results showed lower sucrose consumption in downshifted groups compared with unshifted controls (the frustrative reward downshift effect). Reward downshift significantly increased alcohol intake, this effect being absent in downshifted animals with access to the wheel. These findings suggest that physical exercise could be useful to prevent alcohol self-medication induced by frustrative nonreward. Public Health Significance Human and nonhuman studies suggest that consumption-dependent reduction in negative affect promotes alcohol intake. This “self-medication behavior” has been observed in frustrating situations involving reward loss. This study showed (in rats) that increased alcohol intake induced by a reward devaluation event was abolished by voluntary wheel running. Physical exercise could therefore be useful to prevent the maladaptive effects of frustration on drug use.