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Rogier A. Kievit
University of Cambridge
88Publications
20H-index
1,791Citations
Publications 88
Newest
#1Anders M. Fjell (University of Oslo)H-Index: 55
#2Øystein Sørensen (University of Oslo)H-Index: 5
Last.Kristine B. Walhovd (University of Oslo)H-Index: 55
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Background: Poor sleep is associated with multiple age-related neurodegenerative and neuropsychiatric conditions. The hippocampus plays a special role in sleep and sleep-dependent cognition, and accelerated hippocampal atrophy is typically seen with higher age. Hence, it is critical to establish how the relationship between sleep and hippocampal volume loss unfolds across the adult lifespan. Methods: Self-reported sleep measures and MRI-derived hippocampal volumes were obtained from 3105 cogniti...
#1Nitzan Shahar (UCL: University College London)H-Index: 6
#2Rani Moran (UCL: University College London)H-Index: 11
Last.Raymond J. Dolan (UCL: University College London)H-Index: 166
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Model-free learning enables an agent to make better decisions based on prior experience while representing only minimal knowledge about an environment’s structure. It is generally assumed that model-free state representations are based on outcome-relevant features of the environment. Here, we challenge this assumption by providing evidence that a putative model-free system assigns credit to task representations that are irrelevant to an outcome. We examined data from 769 individuals performing a...
#1Rogier A. Kievit (UCL: University College London)H-Index: 20
#2Rogier A. Kievit (UCL: University College London)H-Index: 1
Last.Kate Nation (University of Oxford)H-Index: 44
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Recent work suggests that the positive manifold of individual differences may arise, or be amplified, by a mechanism called mutualism. Kievit et al. (2017) showed that a latent change score implementation of the mutualism model outperformed alternative models, demonstrating positive reciprocal interactions between vocabulary and reasoning during development. Here, we replicated these findings in a cohort of children (N = 227, 6–8 years old) and expanded the findings in three directions. First, a...
#1Delia Fuhrmann (Cognition and Brain Sciences Unit)H-Index: 4
#2Ivan L. Simpson-Kent (Cognition and Brain Sciences Unit)H-Index: 1
Last.Rogier A. Kievit (Cognition and Brain Sciences Unit)H-Index: 20
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#1Susanne Schweizer (UCL: University College London)H-Index: 11
#2Jovita Leung (UCL: University College London)H-Index: 2
Last.Sarah-Jayne Blakemore S-J (UCL: University College London)H-Index: 64
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Background: 75% of all mental health problems have their onset before the end of adolescence. Therefore, adolescence may be a particularly sensitive time period for preventing mental health problems. Affective control, the capacity to engage with goal relevant and inhibit distracting information in affective contexts, has been proposed as a potential target for prevention. In this study, we will explore the impact of improving adolescents’ affective control capacity on their mental health. Metho...
#1Arman Eshaghi (UCL: University College London)H-Index: 8
#2Rogier A. Kievit (University of Cambridge)H-Index: 20
Last.Olga Ciccarelli (UCL: University College London)H-Index: 48
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Understanding the mode of action of drugs is a challenge with conventional methods in clinical trials. Here, we aimed to explore whether simvastatin effects on brain atrophy and disability in secondary progressive multiple sclerosis (SPMS) are mediated by reducing cholesterol or are independent of cholesterol. We applied structural equation models to the MS-STAT trial in which 140 patients with SPMS were randomized to receive placebo or simvastatin. At baseline, after 1 and 2 years, patients und...
#1Micah Allen (University of Cambridge)H-Index: 2
#2Davide Poggiali (UNIPD: University of Padua)H-Index: 5
Last.Rogier A. Kievit (University of Cambridge)H-Index: 20
view all 5 authors...
Across scientific disciplines, there is a rapidly growing recognition of the need for more statistically robust, transparent approaches to data visualization. Complementary to this, many scientists have called for plotting tools that accurately and transparently convey key aspects of statistical effects and raw data with minimal distortion. Previously common approaches, such as plotting conditional mean or median barplots together with error-bars have been criticized for distorting effect size, ...
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