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Alireza Salami
Karolinska Institutet
PsychologyNeuroscienceCognitionCognitive psychologyEpisodic memory
49Publications
16H-index
1,629Citations
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Publications 48
Newest
#1Jarkko Johansson (Umeå University)H-Index: 10
#1Jarkko Johansson (Umeå University)H-Index: 12
Last. Lars Nyberg (Umeå University)H-Index: 81
view all 6 authors...
Abstract The HERA (Hemispheric Encoding/Retrieval Asymmetry) model captures hemispheric lateralization of prefrontal cortex (PFC) brain activity during memory encoding and retrieval. Reduced HERA has been observed in cross-sectional aging studies, but there is no longitudinal evidence, to our knowledge, on age-related changes in HERA and whether maintained or reduced HERA relates to well-preserved memory functioning. In the present study we set out to explore HERA in a longitudinal neuroimaging ...
1 CitationsSource
#1Nianming ZuoH-Index: 7
#2Alireza SalamiH-Index: 16
Last. Tianzi JiangH-Index: 67
view all 5 authors...
Abstract The multiple demand network (MDN) is conceptualized as the core processing system for multi-tasking. Increasing evidence also provides strong support for the involvement of the MDN in fluid intelligence (gF), i.e., the ability to solve new problems. However, the underlying neural mechanisms of declining intelligence in old age are poorly explored, particularly whether maintenance of the functional architecture of the MDN can characterize superior intelligence in successful aging. Here, ...
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#1Goran Papenberg (KI: Karolinska Institutet)H-Index: 15
#2Lars Jonasson (Umeå University)H-Index: 5
Last. Lars Bäckman (KI: Karolinska Institutet)H-Index: 85
view all 14 authors...
The dopamine D2/3 system is fundamental for sensory, motor, emotional, and cognitive aspects of behavior. Small-scale human histopathological and animal studies show high density of D2/3 dopamine receptors (D2/3DR) in striatum, but also demonstrate the existence of such receptors across cortical and limbic regions. Assessment of D2/3DR BPND in the extrastriatal regions with [11C]raclopride has long been considered unreliable due to the relatively low density of D2/3DR outside the striatum. We de...
1 CitationsSource
#1Nina Karalija (Umeå University)H-Index: 5
#2Andreas Wåhlin (Umeå University)
Last. Lars Nyberg (Umeå University)H-Index: 81
view all 17 authors...
Objective The aging brain undergoes several changes, including reduced vascular, structural, and dopamine (DA) system integrity. Such brain changes have been associated with age‐related cognitive deficits. However, their relative importance, interrelations, and links to risk factors remain elusive.
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#1Nina Becker (KI: Karolinska Institutet)H-Index: 3
#2Grégoria Kalpouzos (KI: Karolinska Institutet)H-Index: 20
Last. Yvonne Brehmer (KI: Karolinska Institutet)H-Index: 17
view all 5 authors...
Abstract Functional magnetic resonance imaging (MRI) studies have demonstrated a critical role of hippocampus and inferior frontal gyrus (IFG) in associative memory. Similarly, evidence from structural MRI studies suggests a relationship between gray-matter volume in these regions and associative memory. However, how brain volume and activity relate to each other during associative-memory formation remains unclear. Here, we used joint independent component analysis (jICA) to examine how gray-mat...
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#1Lars Nyberg (Umeå University)H-Index: 81
#2Micael Andersson (Umeå University)H-Index: 11
Last. Anders Wahlin (Umeå University)H-Index: 27
view all 5 authors...
Hippocampal hypo- as well as hyper-activation have been reported during memory encoding in older individuals. Prefrontal cortex provides top-down state signals to the hippocampus that bias its computation during memory encoding and retrieval, and disturbed top-down signals could contribute to hippocampal hyper-activation. Here we used > 500 cross-sectional and longitudinal observations from a face-name encoding-retrieval fMRI task to examine hippocampal hypo- and hyper-activation in aging. Age-r...
1 CitationsSource
#1Nina Karalija (Umeå University)H-Index: 5
#2Lars Jonassson (Umeå University)H-Index: 1
Last. Carl-Johan Boraxbekk (Umeå University)H-Index: 10
view all 9 authors...
In vivo dopamine D2-receptor availability is frequently assessed with 11C-raclopride and positron emission tomography. Due to low signal-to-noise ratios for 11C-raclopride in areas with low D2 rece...
1 CitationsSource
#1Goran Papenberg (KI: Karolinska Institutet)H-Index: 15
#2Nina Karalija (Umeå University)H-Index: 5
Last. Lars Bäckman (KI: Karolinska Institutet)H-Index: 85
view all 11 authors...
2 CitationsSource
#1Nianming ZuoH-Index: 7
#2Alireza Salami (KI: Karolinska Institutet)H-Index: 16
Last. Tianzi JiangH-Index: 67
view all 6 authors...
Working memory (WM) is a complex and pivotal cognitive system underlying the performance of many cognitive behaviors. Although individual differences in WM performance have previously been linked to the blood oxygenation level-dependent (BOLD) response across several large-scale brain networks, the unique and shared contributions of each large-scale brain network to efficient WM processes across different cognitive loads remain elusive. Using a WM paradigm and functional magnetic resonance imagi...
1 CitationsSource
#1Goran Papenberg (KI: Karolinska Institutet)H-Index: 15
#2Nina KaralijaH-Index: 5
Last. Lars Bäckman (KI: Karolinska Institutet)H-Index: 85
view all 9 authors...
Episodic memory is a polygenic trait influenced by different molecular mechanisms. We used PET and a candidate gene approach to investigate how individual differences at the molecular level transla...
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