@misc{BaltesSowarkaKliegl1989,
  author    = {Baltes, Paul B. and Sowarka, Doris and Kliegl, Reinhold},
  title     = {Cognitive training research on fluid intelligence in old age : what can older adults achieve by themselves?},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-40297},
  year      = {1989},
  abstract  = {Cognitive research on the plasticity of fluid intelligence has demonstrated that older adults benefit markedly from guided practice in cognitive skills and problem-solving strategies. We examined to what degree older adults are capable by themselves of achieving similar practice gains, focusing on the fluid ability of figural relations. A sample of 72 healthy older adults was assigned randomly to three conditions: control, tutor-guided training, self-guided training. Training time and training materials were held constant for the two training conditions. Posttraining performances were analyzed using a transfer of training paradigm in terms of three indicators: correct responses, accuracy, and level of item difficulty. The training programs were effective and produced a significant but narrow band of within-ability transfer. However, there was no difference between the two training groups. Older adults were shown to be capable of producing gains by themselves that were comparable to those obtained following tutor-guided training in the nature of test-relevant cognitive skills.},
  language  = {en}
}
@misc{KlieglSmithBaltes1989,
  author    = {Kliegl, Reinhold and Smith, Jacqui and Baltes, Paul B.},
  title     = {Testing-the-limits and the study of adult age differences in cognitive plasticity of a mnemonic skill},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-40311},
  year      = {1989},
  abstract  = {Investigated the range and limits of cognitive reserve capacity as a general approach to the understanding of age differences in cognitive functioning. Testing-the-limits is proposed as a research strategy, Data are reported from 2 training studies involving old (65 to 83 years old) and young adults (19 to 29 years old). The training, designed to engineer an expertise in serial word recall, involved instruction and practice in the Method of Loci. Substantial plasticity was evident in pretest to posttest comparisons. Participants raised their serial word recall several times above that of pretest baseline. Age-differential limits in reserve capacity were evident in amount of training gain but not in responses to conditions of increased test difficulty (speeded stimulus presentation). Group differences were magnified by the training to such a degree that age distributions barely overlapped at posttests. Testing-the-limits offers promise in terms of understanding the extent and nature of cognitive plasticity.},
  language  = {en}
}
@misc{BaltesKlieglDittmannKohli1988,
  author    = {Baltes, Paul B. and Kliegl, Reinhold and Dittmann-Kohli, Freya},
  title     = {On the locus of training gains in research on the plasticity of fluid intelligence in old age},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-40288},
  year      = {1988},
  abstract  = {Cognitive training research has shown that many older adults have a substantial reserve capacity in fluid intelligence. Little is known, however, about the locus of plasticity. Two studies were conducted to examine whether training gains in fluid abilities are critically dependent on experimenter-guided training and/or whether older adults can achieve similar improvements by themselves on the basis of cognitive skills already available in their repertoire. Several comparisons were made: (a) between test performances after trainer-guided training in ability-specific cognitive skills and after self-guided retest practice (without feedback), (b) between performances under speeded and power conditions of assessment, (c) between performances on easy and difficult items, and (d) between the relative numbers of correct and wrong answers. Results suggest that a large share of the training improvement shown by the elderly can plausibly be explained as the result of the activation and practice of cognitive skills already available in their repertoire. The results also have implications for educational practice, pointing to the appropriateness of strategies of self-directed learning for many elderly adults.},
  language  = {en}
}
@misc{BaltesKliegl1986,
  author    = {Baltes, Paul B. and Kliegl, Reinhold},
  title     = {On the dynamics between growth and decline in the aging of intelligence and memory},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41116},
  year      = {1986},
  abstract  = {Content: - Different Intellectual Abilities Age Differently - Cultural Change and Interindividual Variability in Aging - Cognitive Intervention Research on Plasticity in Old Age * Psychological Evidence * Brain-Physiological Evidence - Age Differences and Testing-the-Limits - Conclusions - Summary},
  language  = {en}
}
@misc{KlieglBaltes1987,
  author    = {Kliegl, Reinhold and Baltes, Paul B.},
  title     = {Das Janusgesicht des Alters : {\"u}ber Wachstum und Abbau in Intelligenz und Ged{\"a}chtnis},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41096},
  year      = {1987},
  abstract  = {Vier Forschungsans{\"a}tze im Bereich der Altersintelligenz und des Altersged{\"a}chtnisses werden referiert: Untersuchungen (1) Uber unterschiedliche Altersverl{\"a}ufe intellektueller und kognitiver Prozesse, (2) {\"u}ber interindividuelle Variabilit{\"a}t und historischen Wandel, (3) {\"u}ber Plastizit{\"a}t und Reservekapazit{\"a}t und (4) {\"u}ber Leistungsgrenzen. Das Wesen der Altersintelligenz ersch{\"o}pft sich nicht in einem Prozeß des Leistungsabfalls. Vielmehr treten sowohl Wachstum als auch Abbau und komplexe Wechselwirkungen zwischen beidem auf. Altersbedingter Abbau zeigt sich am ehesten an den Leistungsgrenzen der Grundmechanismen der Intelligenz. Wachstum kann in jenen Bereichen stattfinden, in denen Menschen Wissenssysteme weiterentwickeln und {\"u}ben (Pragmatik der Intelligenz). Die Methode des Belastungstests (Testing-the-Limits oder Grenztesten) wird als eine Strategie vorgestellt, mit deren Hilfe Mechanismen positiver und negativer Ver{\"a}nderungen beim kognitiven Altern bestimmt werden k{\"o}nnen. Die Anwendung des kognitiven Belastungstests wird f{\"u}r die neuropsychologische Forschung, beispielsweise f{\"u}r Untersuchungen {\"u}ber die Altersdemenz, empfohlen.},
  language  = {de}
}
@misc{KlieglSmithLindenbergeretal.1993,
  author    = {Kliegl, Reinhold and Smith, Jacqui and Lindenberger, Ulman and Mayr, Ulrich and Krampe, Ralf and Baltes, Paul B.},
  title     = {Max-Planck-Institut f{\"u}r Bildungsforschung Berlin},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41124},
  year      = {1993},
  language  = {de}
}
@misc{BaltesDittmannKohliKliegl1986,
  author    = {Baltes, Paul B. and Dittmann-Kohli, Freya and Kliegl, Reinhold},
  title     = {Reserve capacity of the elderly in aging-sensitive tests of fluid intelligence : replication and extension},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-39939},
  year      = {1986},
  abstract  = {Fluid intelligence belongs to that cluster of intellectual abilities evincing aging loss. To examine further the range of intellectual reserve available to aging individuals and the question of replicability in a new cultural and laboratory setting, 204 healthy older adults (mean age = 72 years; range = 60-86) participated in a short-term longitudinal training study. For experimental subjects, 10 sessions consisted of cognitive training involving two subability tests (Figural Relations, Induction) of fluid intelligence. The pattern of outcomes replicates and expands on earlier studies. Older adults have the reserve to evince substantial increases in levels of performance in fluid intelligence tests. Transfer of training, however, is narrow in scope. Training also increases accuracy of performance and the ability to solve more difficult test items. Difficulty level was estimated in a separate study, with a comparable sample of N = 112 elderly adults. Future research is suggested to examine whether intellectual reserve extends to near-maximum levels of performance.},
  language  = {en}
}
@misc{KlieglSmithHeckhausenetal.1986,
  author    = {Kliegl, Reinhold and Smith, Jacqui and Heckhausen, Jutta and Baltes, Paul B.},
  title     = {Ausbildung zum Ged{\"a}chtnisk{\"u}nstler : ein experimenteller Zugang zur {\"U}berpr{\"u}fung von Theorien kognitiven Lernens und Alterns},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-40247},
  year      = {1986},
  abstract  = {Der hier berichtete Forschungsansatz kombiniert entwicklungs- und kognitionspsychologische Fragestellungen. Das entwicklungspsychologische Ziel war, Potential und Grenzen latenter kognitiver Leistungsreserven bei jungen und {\"a}lteren Erwachsenen sichtbar zu machen. Eine systematische Heranf{\"u}hrung an Leistungsgrenzen sollte außerdem die unterschiedliche Alterssensitivit{\"a}t kognitiver Prozesse verdeutlichen und zu einer Vergr{\"o}ßerung interindividueller Unterschiede f{\"u}hren. Das kognitionspsychologische Ziel war, die Genese kognitiver Expertise unter Laborbedingungen zu simulieren, wobei vor allem die Transformation von Laien- in Expertenwissen untersucht werden sollte. Diese {\"U}berlegungen wurden in einem Trainingsprogramm {\"u}berpr{\"u}ft, in dessen Verlauf junge und {\"a}ltere Erwachsene in einer Ged{\"a}chtniskunst f{\"u}r das Behalten von Zufallszahlen und Wortlisten unterwiesen wurden. Die Brauchbarkeit dieses experimentellen Paradigmas f{\"u}r die {\"U}berpr{\"u}fung der theoretischen Fragen wird durch Ergebnisse aus vier Einzelfallstudien belegt.},
  language  = {de}
}
@misc{KlieglSmithBaltes1986,
  author    = {Kliegl, Reinhold and Smith, Jacqui and Baltes, Paul B.},
  title     = {Testing-the-limits, expertise, and memory in adulthood and old age},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-39063},
  year      = {1986},
  abstract  = {This research has three interrelated foci: (i) engineering and testing a cognitive model of expert memory, (ii) the study of intellectual reserve capacity and (iii) the use of a testing-the-limits methodology to magnify and delineate age differences in limits of reserve capacity. The assumption is that age differences are magnified if studied at high levels of expertise or task difficulty. Results from age-comparative point training studies in expert memory are reported. Both young and elderly subjects reached high levels of skilled memory, confirming the model. However, despite this sizeable reserve capacity, when compared to IQ-eguivalent young adults, superior elderly showed decline in upper limits of function.},
  language  = {en}
}
@misc{BaltesKliegl1992,
  author    = {Baltes, Paul B. and Kliegl, Reinhold},
  title     = {Further testing of limits of cognitive plasticity : negative age differences in a mnemonic skill are robust},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-40373},
  year      = {1992},
  abstract  = {Earlier testing-the-limits research on age differences in cognitive plasticity of a memory skill was extended by 18 additional assessment and training sessions to explore whether older adults were able to catch up with additional practice and improved training conditions. The focus was on the method of loci, which requires mental imagination to encode and retrieve lists of words from memory in serial order. Of the original 37 subjects, 35 (16 young, ranging from 20 to 30 years of age, and 19 older adults, ranging from 66 to 80 years of age) participated in the follow-up study. Older adults showed sizable performance deficits when compared with young adults and tested for limits of reserve capacity. The negative age difference was substantial, resistant to extensive practice, and applied to all subjects studied. The primary origin for this negative age difference may be a loss in the production and use of mental imagination for operations of the mind.},
  language  = {en}
}