Prospective memory refers to the ability to remember to carry out delayed intentions, more precisely, to remember to initiate and execute an intended action at some point in the future. The development and progression of prospective memory across the lifespan is still heavily under debate. Only few studies have so far investigated prospective memory development in childhood, revealing an inconsistent pattern. In adulthood, studies in the laboratory and naturalistic studies showed paradoxical results with age deficits in the laboratory and age benefits in naturalistic tasks. Up to now, no conceptual model has been suggested to guide research on prospective memory development across the lifespan. Thus, the present work examined the effect of central factors from the multiprocess framework (McDaniel & Einstein, 2000) on the development of prospective memory in four different age-groups: pre-schoolers, school-age children, young and old adults. The first study explored the role of task motivation in age differences in prospective memory performance across the pre-school age-range. No main effect of age or motivation in prospective memory performance was found, yet a significant interaction, indicating that for younger children motivation or task importance may help allocating the available resources to the task elements of interest. Evidence from the second study indicated that 9-10 year old school children outperform 6-7 year old school children on a measure of prospective memory, and that retrieval-based factors (ongoing task absorption, cue salience, cue focality) systematically influenced performance. Of particular importance for possible developmental mechanisms was the finding of an age x cue focality interaction, suggesting that age effects may be modulated by cue focality. The third study examined the effect of task setting in a laboratory procedure and the effect of motivation in a naturalistic procedure on prospective memory performance in young and older adults. Results from the laboratory prospective memory procedure revealed significant age-related decline for irregular tasks but not for regular and focal tasks. In addition, in the naturalistic procedure, the age benefit was eliminated when young adults were motivated by incentives. Results from the present work indicated that already pre-school age children were able to remember to perform intended actions and this ability increased across school-age. In adulthood, the results revealed a decline with age on a pure performance level. Yet, older adults may be able to compensate for basic cognitive impairments if task conditions reduce the need for controlled attention. Furthermore, the present work suggest, that factors of the multiprocess framework may indeed affect age-differences in prospective memory performance throughout the lifespan, as cue focality and task importance were related to prospective memory development in children and adults. Thus, the multiprocess approach might serve as foundation for a lifespan theory of the development of prospective memory.

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Prospective memory refers to the ability to remember to carry out delayed intentions, more precisely, to remember to initiate and execute an intended action at some point in the future. The development and progression of prospective memory across the lifespan is still heavily under debate. Only few studies have so far investigated prospective memory development in childhood, revealing an inconsistent pattern. In adulthood, studies in the laboratory and naturalistic studies showed paradoxical results with age deficits in the laboratory and age benefits in naturalistic tasks. Up to now, no conceptual model has been suggested to guide research on prospective memory development across the lifespan. Thus, the present work examined the effect of central factors from the multiprocess framework (McDaniel & Einstein, 2000) on the development of prospective memory in four different age-groups: pre-schoolers, school-age children, young and old adults. The first study explored the role of task motivation in age differences in prospective memory performance across the pre-school age-range. No main effect of age or motivation in prospective memory performance was found, yet a significant interaction, indicating that for younger children motivation or task importance may help allocating the available resources to the task elements of interest. Evidence from the second study indicated that 9-10 year old school children outperform 6-7 year old school children on a measure of prospective memory, and that retrieval-based factors (ongoing task absorption, cue salience, cue focality) systematically influenced performance. Of particular importance for possible developmental mechanisms was the finding of an age x cue focality interaction, suggesting that age effects may be modulated by cue focality. The third study examined the effect of task setting in a laboratory procedure and the effect of motivation in a naturalistic procedure on prospective memory performance in young and older adults. Results from the laboratory prospective memory procedure revealed significant age-related decline for irregular tasks but not for regular and focal tasks. In addition, in the naturalistic procedure, the age benefit was eliminated when young adults were motivated by incentives. Results from the present work indicated that already pre-school age children were able to remember to perform intended actions and this ability increased across school-age. In adulthood, the results revealed a decline with age on a pure performance level. Yet, older adults may be able to compensate for basic cognitive impairments if task conditions reduce the need for controlled attention. Furthermore, the present work suggest, that factors of the multiprocess framework may indeed affect age-differences in prospective memory performance throughout the lifespan, as cue focality and task importance were related to prospective memory development in children and adults. Thus, the multiprocess approach might serve as foundation for a lifespan theory of the development of prospective memory.

Plasticity is a central concept within the life-span approach of development and is defined as the ability of an individual to change and reorganize in response to environmental challenges (e.g., Baltes & Singer, 20019. Such intraindividual changes can be induced by systematic cognitive training. Recent studies suggest that substantial amounts of plasticity can be induced in executive control functions with a process-based training approach. These newer studies show that repeated practice on executive control tasks not only improved performance on these trained tasks, but also led to improvements in nontrained tasks (i.e., transfer; e.g., Jaeggi, Buschkuehl, Jonides, & Perrig, 2008; Karbach & Kray, 2009). Executive control processes are especially relevant from a developmental perspective because executive control is involved in a wide range of complex cognitive activities (e.g., van der Sluis, de Jong, & van der Leij, 2007) and is one of the most central areas of cognitive development (e.g., Craik & Bialystok, 2006). The current thesis aimed at elucidating several important questions concerning the plasticity of executive control functions induced by systematic cognitive training. Firstly, the amount, range, and stability of plasticity in adolescents and older adults were investigated. Secondly, studies explored if training design, age, and interindividual differences moderate the amount and range of plasticity. Furthermore, the current thesis aimed at exploring how process-based training specifically leads to transfer effects. To explore these questions, all studies employed a pretest-posttest-design comparing a group of participants that was trained with a process-based training approach to a group of control partici-pants that did not receive the training. Pretraining and posttraining sessions incorporated systematic assessment of transfer measures in different cognitive domains. The first study set out to investigate if executive control can be trained in adolescents with a task switching training. Additionally, the study explored what particular domains of executive control may underlie training and transfer effects, and if acute bouts of exercise directly prior to cognitive training enhance training effects. Analyses indicated substantial training effects for both training groups (with or without acute exercise) and near transfer to a similar switching task. Other findings of transfer were limited to a speed task and a tendency for faster reaction times in an updating task. Thus, findings indicate, for the first time, that executive control can be enhanced in adolescents through a short training. Furthermore, analyses suggest that updating may be of particular relevance for the effects of the task switching training. Analyses revealed no additional effects of the exercise intervention. The second study set out to explore, for the first time, the effects of a process-based training ap-proach in old-old age (above 80 years). After ten sessions of practice on working memory tasks, the training group improved in four of the five trained tasks, emphasizing the potential for plasticity even in old-old age. The gains in the training group were largely driven by individuals who started out with a low capacity in the training tasks. Thus, findings suggest that working memory can be improved with a short executive control training even in old-old age, particularly for low-capacity individuals. The absence of transfer effects in this study may point to the limits of plasticity in this age group. The third study aimed at further elucidating the mixed findings regarding the amounts of training and transfer effects induced by executive control training in older adults. For that purpose, a sample of older adults covering a wide range from young-old to old-old age (65 to 95 years) was either trained for nine sessions on a visuospatial and a verbal working memory as well as an executive control task; or served as controls. Analyses revealed significant training effects in all three trained tasks, as well as near transfer to verbal working memory and far transfer to a nonverbal reasoning task. Remarkably, all training effects and the transfer effect to verbal working memory were even stable at a nine-month follow-up. These findings suggest that cognitive plasticity is preserved over a large range of old age and that even a rather short training regimen can lead to (partly specific) training and transfer effects. However, analyses also revealed that there are a range of factors that may moderate the amount of plasticity, e.g., age and baseline performance in the training domain. To summarize, the current thesis explored effects of short executive control trainings on cognitive functions in adolescents and older adults. The findings suggest a high potential for intraindividual variability across the whole life-span. Plasticity was shown on the level of training and transfer tasks, as well as on the level of stability of effects. Furthermore, results support the notion that process-based training improves executive control processes that in turn lead to improvements in tasks that rely on these processes. The current thesis makes important contributions to the conceptual debate about the potentials and limits of training-induced plasticity across the life-span. It benefits the debate in that it specifically delineates factors that moderate the obtained effects.

In den letzten Jahrzehnten führten abnehmende Geburtenraten und die zunehmende Lebenserwartung zur Alterung der deutschen Bevölkerung. Zur Sicherung des Rentensystems wurde das Renteneintrittsalter auf 67 Jahre angehoben. Um die Arbeitsfähigkeit zu erhalten und den technologischen wie organisationalen Wandel zu bewältigen, fordert die Europäische Union zum lebenlangen Lernen auf. Diese Dissertation bietet einen Literaturüberblick und drei empirische Aufsätze, die die Weiterbildungsmotivation älterer Arbeitnehmer auf ihre demographische Relevanz untersuchen und altersspezifische Einflüsse von arbeitsbezogenen Faktoren sowie Altersheterogenität belegen. Der Literaturüberblick erläutert die demografische Relevanz älterer Arbeitnehmer, ihren Altersübergang, ihre Arbeitsmotivation und Weiterentwicklung. Anhand von Querschnittsdaten wird der positive Zusammenhang von Weiterbildungsmotivation mit Arbeitsfähigkeit und dem Weiterbeschäftigungswunsch gezeigt. Die Weiterbildungsmotivation Älterer ist über alle Befragtengruppen hoch, was darauf hin deutet, dass Partizipationsungleichheiten weniger von unterschiedlichen Motivationslagen, sondern von anderen Barrieren abhängen. Eine weitere Analyse identifiziert altersspezifische Unterschiede in Hinblick auf den Einfluss von Arbeitsplatzfaktoren auf die Weiterbildungsmotivation. Es zeigen sich schwache aber signifikante Einflüsse einiger Faktoren. Anhand von Längsschnittdaten lässt sich zunehmende Altersheterogenität in Bezug auf die Zufriedenheit mit dem Leben, Arbeit, Familienleben und Gesundheit feststellen. In der Zusammenfassung ist die Weiterbildungsmotivation älterer Arbeitnehmer hoch, sie wird durch den Arbeitskontext beeinflusst und hängt positiv mit der Arbeitsfähigkeit und dem Weiterbeschäftigungswunsch im Rentenalter zusammen. Übliche Mittelwertanalysen älterer Arbeitnehmer haben nur begrenzte Aussagekraft. / Decreasing birth rates and increasing life expectancy have led to the ageing of the German population during the past decades. To sustain the German retirement system, retirement age is increased to 67 years. The European Union calls for individuals’ lifelong learning to maintain work ability and cope with challenges of technological and organisational change. This dissertation consists of a literature overview and three empirical essays investigating older workers’ motivation to participate in continuing education (MPCE) and its demographic relevance, highlighting age-specific work context influences and providing evidence for older workers’ heterogeneity. The literature overview delineates older workers’ demographic relevance as well as their transition to retirement, work motivation, development opportunities, and education. Second, the analysis of cross-sectional data establishes the relevance of older workers’ MPCE for the policy of prolonging working life by showing the positive relationship with work ability and the desire to work past retirement age. Older workers’ MPCE is high across all respondent groups, implying that inequalities in participation are less a result of varying motivation among subgroups, but of other barriers. Following this, work context-related motivational differences between older and younger workers are identified and analysed. Results show weak but significant influences of some work context factors. The analysis of longitudinal data shows ageing workers’ increasing heterogeneity of life satisfaction and satisfaction with work, family life, and health, corroborating life-span theories. In sum, MPCE is high among older workers. It is influenced by work context, and positively related to work ability and the desire to work past retirement age. Common mean-level analyses of older workers yield only limited informative value.

Das autobiografische Gedächtnis findet als Thema der psychologischen Grundlagenforschung immer größere Aufmerksamkeit. Vorliegende Arbeiten haben zur differenzierten Charakterisierung des autobiografischen Wissensbestands in seiner Gesamtheit und der autobiografischen Erinnerungen als dessen Elemente beigetragen. Neben Fragen der Repräsentation liegt es nahe, Besonderheiten des autobiografischen Gedächtnisses über die Lebensspanne hinweg zu betrachten. Schwerpunkt der Analysen ist die Verteilung individueller Erinnerungen an Ereignisse über den gesamten Lebenslauf. Das zentrale Merkmal der Verteilung ist der relative Anstieg der Zahl von Erinnerungen im Zeitraum zwischen dem 10.und dem 30. Lebensjahr, vergleicht man diese mit der Zahl von Erinnerungen in den Lebensabschnitten direkt vor diesem und direkt im Anschluss an diesen Zeitabschnitt. Die Analyse dieser robusten und reliablen Besonderheit der Verteilung autobiografischer Erinnerungen - des bump - ist Gegenstand der vorliegenden empirischen Arbeit. Im Gegensatz zu bisherigen Studien galt unser Interesse aber nicht nur frei wählbaren Erinnerungen. Es stand vielmehr die Klasse der lebendigen autobiografischen Erinnerungen im Mittelpunkt, die innerhalb des autobiografischen Wissensbestands unterschiedlichen, aber in der individuellen Entwicklung über die Lebensspanne relevanten, von uns vorgegebenen Themen zuzuordnen sind (Arbeitsleben Beziehung zu Geschwistern, Beziehung zu Freunden und Bekannten, zusätzlich: Allgemeine lebendige Erinnerungen ohne thematische Bindung). Die berichteten Erinnerungen verteilten sich insgesamt in typischer Weise über die Lebensspanne. Unabhängig von themenspezifischen Aspekten zeigte sich auch in der vorliegenden Studie der bump in der Gesamtverteilung autobiografischer Erinnerungen über die Lebensspanne. Bei den themenspezifischen Verteilungen waren jedoch Abweichungen von der erwarteten Verteilungsform festzustellen. Der bump ließ sich bei den Themen Arbeitsleben und Freunde, Bekannte nur in abgeschwächter Form identifizieren, beim Thema Zwillinge war er dagegen auf einen früheren Zeitpunkt als erwartet datiert und sehr ausgeprägt. Die Verteilung im Themenblock Allgemein deckte sich weitgehend mit dem erwarteten Verteilungsmuster. Durch Einbindung in ein größeres Forschungsprojekt konnten die Verteilungen in den Themen Zwillinge und Arbeitsleben im Kontext relevanter biografischer Informationen weiter analysiert und z.T. auf lebensalters- und kontextgebundene Entwicklungen zurückgeführt werden. Die Ergebnisse der Studie werden im Hinblick auf ihre theoretischen Implikationen und ihre Bedeutung für nachfolgende Arbeiten aus einer entwicklungspsychologischen Perspektive diskutiert.

Plasticity is a central concept within the life-span approach of development and is defined as the ability of an individual to change and reorganize in response to environmental challenges (e.g., Baltes & Singer, 20019. Such intraindividual changes can be induced by systematic cognitive training. Recent studies suggest that substantial amounts of plasticity can be induced in executive control functions with a process-based training approach. These newer studies show that repeated practice on executive control tasks not only improved performance on these trained tasks, but also led to improvements in nontrained tasks (i.e., transfer; e.g., Jaeggi, Buschkuehl, Jonides, & Perrig, 2008; Karbach & Kray, 2009). Executive control processes are especially relevant from a developmental perspective because executive control is involved in a wide range of complex cognitive activities (e.g., van der Sluis, de Jong, & van der Leij, 2007) and is one of the most central areas of cognitive development (e.g., Craik & Bialystok, 2006). The current thesis aimed at elucidating several important questions concerning the plasticity of executive control functions induced by systematic cognitive training. Firstly, the amount, range, and stability of plasticity in adolescents and older adults were investigated. Secondly, studies explored if training design, age, and interindividual differences moderate the amount and range of plasticity. Furthermore, the current thesis aimed at exploring how process-based training specifically leads to transfer effects. To explore these questions, all studies employed a pretest-posttest-design comparing a group of participants that was trained with a process-based training approach to a group of control partici-pants that did not receive the training. Pretraining and posttraining sessions incorporated systematic assessment of transfer measures in different cognitive domains. The first study set out to investigate if executive control can be trained in adolescents with a task switching training. Additionally, the study explored what particular domains of executive control may underlie training and transfer effects, and if acute bouts of exercise directly prior to cognitive training enhance training effects. Analyses indicated substantial training effects for both training groups (with or without acute exercise) and near transfer to a similar switching task. Other findings of transfer were limited to a speed task and a tendency for faster reaction times in an updating task. Thus, findings indicate, for the first time, that executive control can be enhanced in adolescents through a short training. Furthermore, analyses suggest that updating may be of particular relevance for the effects of the task switching training. Analyses revealed no additional effects of the exercise intervention. The second study set out to explore, for the first time, the effects of a process-based training ap-proach in old-old age (above 80 years). After ten sessions of practice on working memory tasks, the training group improved in four of the five trained tasks, emphasizing the potential for plasticity even in old-old age. The gains in the training group were largely driven by individuals who started out with a low capacity in the training tasks. Thus, findings suggest that working memory can be improved with a short executive control training even in old-old age, particularly for low-capacity individuals. The absence of transfer effects in this study may point to the limits of plasticity in this age group. The third study aimed at further elucidating the mixed findings regarding the amounts of training and transfer effects induced by executive control training in older adults. For that purpose, a sample of older adults covering a wide range from young-old to old-old age (65 to 95 years) was either trained for nine sessions on a visuospatial and a verbal working memory as well as an executive control task; or served as controls. Analyses revealed significant training effects in all three trained tasks, as well as near transfer to verbal working memory and far transfer to a nonverbal reasoning task. Remarkably, all training effects and the transfer effect to verbal working memory were even stable at a nine-month follow-up. These findings suggest that cognitive plasticity is preserved over a large range of old age and that even a rather short training regimen can lead to (partly specific) training and transfer effects. However, analyses also revealed that there are a range of factors that may moderate the amount of plasticity, e.g., age and baseline performance in the training domain. To summarize, the current thesis explored effects of short executive control trainings on cognitive functions in adolescents and older adults. The findings suggest a high potential for intraindividual variability across the whole life-span. Plasticity was shown on the level of training and transfer tasks, as well as on the level of stability of effects. Furthermore, results support the notion that process-based training improves executive control processes that in turn lead to improvements in tasks that rely on these processes. The current thesis makes important contributions to the conceptual debate about the potentials and limits of training-induced plasticity across the life-span. It benefits the debate in that it specifically delineates factors that moderate the obtained effects.:Abstract ..............................................................................................1 1 General Introduction .....................................................................3 1.1 Plasticity of cognitive functions ...................................................5 1.2 Executive control functions .........................................................6 1.3 Cognitive training of executive control functions .......................9 2 Outline and Central Questions ......................................................19 2.1 What amount of plasticity does executive control training induce in different age groups? .........................................................................19 2.2 Do training and transfer effects of executive control training remain stable over time? ....................................................................20 2.3 Do training design, age, and baseline performance moderate the amount of plasticity? ...........................................................................20 2.4 Are changes in trained tasks specifically related to changes in transfer tasks? .................................................................................21 3 Study 1 - Effects of a Task Switching Training in Adolescents .......22 3.1 Introduction ..............................................................................22 3.2 Methods ....................................................................................27 3.3 Results ......................................................................................33 3.4 Discussion .................................................................................43 4 Study 2 - Effects of a Working Memory Training in Old-Old adults .48 4.1 Introduction ...............................................................................48 4.2 Methods .....................................................................................51 4.3 Results .......................................................................................54 4.4 Discussion ..................................................................................59 5 Study 3 - Factors Moderating Effects of Working Memory Training in Older Adults .......................................................................63 5.1 Introduction ................................................................................63 5.2 Methods ......................................................................................67 5.3 Results .........................................................................................71 5.4 Discussion ...................................................................................78 6 General Discussion .........................................................................83 6.1 Summary of empirical findings .....................................................83 6.2 Integration of the main empirical findings ...................................85 6.3 Conclusion and Outlook ...............................................................95 6.4 Summary ......................................................................................98 References ..........................................................................................99 Appendix ............................................................................................112

Das autobiografische Gedächtnis findet als Thema der psychologischen Grundlagenforschung immer größere Aufmerksamkeit. Vorliegende Arbeiten haben zur differenzierten Charakterisierung des autobiografischen Wissensbestands in seiner Gesamtheit und der autobiografischen Erinnerungen als dessen Elemente beigetragen. Neben Fragen der Repräsentation liegt es nahe, Besonderheiten des autobiografischen Gedächtnisses über die Lebensspanne hinweg zu betrachten. Schwerpunkt der Analysen ist die Verteilung individueller Erinnerungen an Ereignisse über den gesamten Lebenslauf. Das zentrale Merkmal der Verteilung ist der relative Anstieg der Zahl von Erinnerungen im Zeitraum zwischen dem 10.und dem 30. Lebensjahr, vergleicht man diese mit der Zahl von Erinnerungen in den Lebensabschnitten direkt vor diesem und direkt im Anschluss an diesen Zeitabschnitt. Die Analyse dieser robusten und reliablen Besonderheit der Verteilung autobiografischer Erinnerungen - des bump - ist Gegenstand der vorliegenden empirischen Arbeit. Im Gegensatz zu bisherigen Studien galt unser Interesse aber nicht nur frei wählbaren Erinnerungen. Es stand vielmehr die Klasse der lebendigen autobiografischen Erinnerungen im Mittelpunkt, die innerhalb des autobiografischen Wissensbestands unterschiedlichen, aber in der individuellen Entwicklung über die Lebensspanne relevanten, von uns vorgegebenen Themen zuzuordnen sind (Arbeitsleben Beziehung zu Geschwistern, Beziehung zu Freunden und Bekannten, zusätzlich: Allgemeine lebendige Erinnerungen ohne thematische Bindung). Die berichteten Erinnerungen verteilten sich insgesamt in typischer Weise über die Lebensspanne. Unabhängig von themenspezifischen Aspekten zeigte sich auch in der vorliegenden Studie der bump in der Gesamtverteilung autobiografischer Erinnerungen über die Lebensspanne. Bei den themenspezifischen Verteilungen waren jedoch Abweichungen von der erwarteten Verteilungsform festzustellen. Der bump ließ sich bei den Themen Arbeitsleben und Freunde, Bekannte nur in abgeschwächter Form identifizieren, beim Thema Zwillinge war er dagegen auf einen früheren Zeitpunkt als erwartet datiert und sehr ausgeprägt. Die Verteilung im Themenblock Allgemein deckte sich weitgehend mit dem erwarteten Verteilungsmuster. Durch Einbindung in ein größeres Forschungsprojekt konnten die Verteilungen in den Themen Zwillinge und Arbeitsleben im Kontext relevanter biografischer Informationen weiter analysiert und z.T. auf lebensalters- und kontextgebundene Entwicklungen zurückgeführt werden. Die Ergebnisse der Studie werden im Hinblick auf ihre theoretischen Implikationen und ihre Bedeutung für nachfolgende Arbeiten aus einer entwicklungspsychologischen Perspektive diskutiert.

Our ability to learn from the outcomes of our actions and to adapt our decisions accordingly changes over the course of the human lifespan. In recent years, there has been an increasing interest in using computational models to understand developmental changes in learning and decision-making. Moreover, extensions of these models are currently applied to study socio-emotional influences on learning in different age groups, a topic that is of great relevance for applications in education and health psychology. In this article, we aim to provide an introduction to basic ideas underlying computational models of reinforcement learning and focus on parameters and model variants that might be of interest to developmental scientists. We then highlight recent attempts to use reinforcement learning models to study the influence of social information on learning across development. The aim of this review is to illustrate how computational models can be applied in developmental science, what they can add to our understanding of developmental mechanisms and how they can be used to bridge the gap between psychological and neurobiological theories of development.

Our ability to learn from the outcomes of our actions and to adapt our decisions accordingly changes over the course of the human lifespan. In recent years, there has been an increasing interest in using computational models to understand developmental changes in learning and decision-making. Moreover, extensions of these models are currently applied to study socio-emotional influences on learning in different age groups, a topic that is of great relevance for applications in education and health psychology. In this article, we aim to provide an introduction to basic ideas underlying computational models of reinforcement learning and focus on parameters and model variants that might be of interest to developmental scientists. We then highlight recent attempts to use reinforcement learning models to study the influence of social information on learning across development. The aim of this review is to illustrate how computational models can be applied in developmental science, what they can add to our understanding of developmental mechanisms and how they can be used to bridge the gap between psychological and neurobiological theories of development.