保护性价值观及其对决策行为的影响

保护性价值观(protected values, PVs)是这样的一种观念:它拒绝与其他任何价值相互交易,尤其拒绝与经济价值进行交易[1]。本文对国内外有关保护性价值观及其对决策行为的影响的研究成果进行了详尽考察和评述,在此基础上,进一步提出了管理领域保护性价值观研究的设想。     

行为决策中的忽略偏差：心理机制与影响因素

忽略偏差是指在由忽略所导致的损失与由行为所导致的同等的或者更少的损失之间, 个体更容易接受忽略所导致的损失。个体在日常行为决策的各种领域, 特别是在公共政策制定中均会出现忽略偏差。目前忽略偏差的心理机制主要有损失规避和标准理论两种。忽略偏差的影响因素主要包括保护性价值观、选择结果的信息知悉度、负性情绪、社会角色和文化价值观念等。未来的研究则需要从忽略偏差的产生根源, 与决策规避中其他偏差的关系, 群体决策中忽略偏差的影响以及忽略偏差的应用研究领域, 特别是公共管理与公共政策领域等方面进行深入的研究。     

Experimental evidence for aggressive antipredator behavior in black skimmers (rynchops niger)

We experimentally studied the aggressive antipredator behavior of black skimmers Rynchops niger nesting in a salt marsh and sandy beach with the use of a live herring gull Larus argentatus. Although there were no significant habitat differences in vegetation cover, distance from the edge of the colony, or nesting density, skimmers nesting in salt marshes were more aggressive toward the herring gull than were those nesting on the beach. Aggression increased during the first three minutes of the test, and decreased slightly thereafter. Aggression levels were highest when the gull moved compared to when it was stationary. Skimmers made few responses when a person was present with the gull, but aggression increased dramatically when only the gull remained. Our results suggest skimmers may engage in more aggressive behavior in defense of their nests than previously thought, particularly when exposed to a predator that actually takes eggs and chicks. Further, we suggest that conclusions about antipredator behavior drawn only from studies of interactions with people may need further amplification. © 1992 Wiley-Liss, Inc.     

Breeding cycle aggression in domesticated zebra finches (Poephila guttata)

Patterns of breeding cycle aggressive behavior were examined in colonies of domesticated zebra finches (Poephila guttata). Aggressive behaviors of zebra finch pairs were low during non-nesting periods but were maintained at high levels during the three nesting periods: the incubating, hatching, and nestling periods. Defense of the nest site was the prominent functional category of aggression, followed by defense of individual distance. Defense of mate, defense of young, and defense of nesting material rarely occurred. Male and female members of pair bonds shared the duties of defense of the nest site and parental care. During observation times males exhibited greater frequencies of aggressive actions throughout the breeding cycle and females spent a greater amount of time in the nest during the three nesting periods. The pattern and functional categories of aggressive behavior in the zebra finch colonies correspond most closely to the nest site defense hypothesis for the evolution of breeding season aggression.     

Maternal aggression in rats: Changes over pregnancy and lactation in a sprague-dawley strain

Maternal aggression in a Sprague-Dawley strain of laboratory rat (Charles River CD) was explored from Day 1 after mating on Day 0 through Day 24 of lactation (L0-L24). Aggression toward unfamiliar male “intruders” during 10-min tests was low among nonpregnant, nonlactating females and during the first 10 days of gestation. Frequency of attack on intruders increased moderately but significantly by Gestation Day 16 (G16; Experiment 1) or G21 (Experiment 2), a prepartum phenomenon not previously reported in laboratory rats. Levels of aggression were highest, however, during the first 9 days of lactation, when attacks averaged more than 6 per 10-min session. Attacks declined sharply in frequency after L14 and by L24 did not exceed levels observed among nonpregnant females. Experiment 3 examined the importance of the test site (home cage with nest and pups, if any, vs unfamiliar cage without nest or pups) to agonistic behavior associated with pregnancy and lactation. Late pregnant females tested in a novel cage were not aggressive; however, females tested shortly after delivering their pups were highly aggressive, averaging over four attacks per 5-min session. In novel cage tests frequency of attack remained high through L4 but declined significantly by L7. These data are consistent with the hypothesis that maternal aggression at its onset is primarily under hormonal control, but becomes increasingly dependent upon external factors, presumably pup stimulation, during the postpartum period.     

The potential effects of protected nests and cage complexity on maternal aggression in house mice

I studied the behavior of nursing house mice (Mus musculus) in captivity and used a two-by-two factorial design to test the hypothesis that the combination of a protected nest along with a chance for the intruders to retreat would improve the ability of resident females to defend their litters from infanticidal males. A chance for the intruder to retreat was manipulated by testing the resident females in either a single- or a two-compartment cage. The effect of a protected nest was examined by providing females with a nest box having a narrow entrance. During each test, an infanticidal adult male was introduced into the cage of a resident female and her pups. I observed that neither the presence of a protected nest nor the chance for the intruders to retreat to a different compartment, or a combination of the two, increased the ability of a female to defend her litter against an intruder male. Moreover, neither of these two factors influenced the overall behavior of the resident females. I obtained similar results after using data from previous studies to examine the influence of both of these factors on the efficiency of maternal aggression. Overall, these two approaches showed that females are often unable to prevent intruders from committing infanticide. I discuss the validity of the hypothesis that maternal aggression evolved as a mechanism to protect offspring from infanticide. Aggr. Behav. 24:385–396, 1998. © 1998 Wiley-Liss, Inc.     

Differential Effects of Short- and Long-Term Early Maternal Separation on Subsequent Maternal Behavior in Rats

Female Sprague-Dawley pups were separated from mothers every other day for 8 hr (long-term separation/LTS), 4 hr (short-term separation/STS), or 0 hr (no separation/NS) from postnatal day 2–20. In adulthood, they were mated and tested for maternal behaviors during two lactations. It was expected that females separated from mothers as pups would show deficits in maternal behavior as adults. Contrary to expectations, LTS showed better nest building and grouped young faster during both lactations. LTS were first to display aggression and displayed more aggression during the second lactation. Notably, while some measures decreased from first to second lactation in NS and STS, LTS maintained levels of maternal care. These results suggest that extended periods of maternal separation may exaggerate some aspects of maternal behavior.     

保护性价值观的结构和特征研究

保护性价值观是一种拒绝与其他任何价值相互交易,尤其拒绝与经济价值进行交易的观念。本文通过问卷调查和分析,将中国文化背景下的保护性价值观分为“有关自然环境和传统文化价值的保护性价值观”和“有关人伦人权和人际情感的保护性价值观”,并发现前者比后者更受重视和更有普遍性。研究还验证了保护性价值观具有的数量不敏感性、当事人相关性、道德责任感、拒绝、愤怒情绪、故作姿态这六个特征,并初步分析了两类保护性价值观在各特征上的差异。     

城乡空巢老人的亲子支持及其与抑郁的关系

采用老年人亲子支持问卷和流调中心用抑郁自评量表(CES-D),对196名老人进行问卷调查,考察城乡空巢老人亲子支持的特点及其与抑郁的关系.结果表明:(1)总体上,老人接受子女的社会支持与给予子女的社会支持差异不显著.(2)在接受子女支持上,服务支持最多,其次是情感和物质支持,非空巢与空巢老人,城市与农村老人均无差异.(3)而在给予子女支持上,情感和服务支持高于物质支持,非空巢与空巢老人无显著差异,而城市老人在各维度上均高于农村老人.(4)影响老人抑郁的亲子支持维度不同:对城市非空巢老人,给予子女的情感支持越多,抑郁水平越低;对城市空巢老人,给予子女的情感支持越多,物质支持越少,抑郁水平越低.农村非空巢老人接受子女的服务支持越多,抑郁水平越低;而对农村空巢老人,亲子支持可能不影响其抑郁.因此,为了提高老年人的心理健康水平,对待不同处境的老年人应采取不同的干预措施.