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Nemati SS, Sadeghi L, Dehghan G, Sheibani N. Lateralization of the hippocampus: A review of molecular, functional, and physiological properties in health and disease. Behav Brain Res 2023; 454:114657. [PMID: 37683813 DOI: 10.1016/j.bbr.2023.114657] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 09/04/2023] [Accepted: 09/05/2023] [Indexed: 09/10/2023]
Abstract
The hippocampus is a part of the brain's medial temporal lobe that is located under the cortex. It belongs to the limbic system and helps to collect and transfer information from short-term to long-term memory, as well as spatial orientation in each mammalian brain hemisphere. After more than two centuries of research in brain asymmetry, the hippocampus has attracted much attention in the study of brain lateralization. The hippocampus is very important in cognitive disorders, related to seizures and dementia, such as epilepsy and Alzheimer's disease. In addition, the motivation to study the hippocampus has increased significantly due to the asymmetry in the activity of the left and right hippocampi in healthy people, and its disruption during some neurological diseases. After a general review of the hippocampal structure and its importance in related diseases, the asymmetry in the brain with a focus on the hippocampus during the growth and maturation of healthy people, as well as the differences created in patients at the molecular, functional, and physiological levels are discussed. Most previous work indicates that the hippocampus is lateralized in healthy people. Also, lateralization at different levels remarkably changes in patients, and it appears that the most complex cognitive disorder is caused by a new dominant asymmetric system.
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Affiliation(s)
- Seyed Saman Nemati
- Department of Biology, Faculty of Natural Sciences, University of Tabriz, 51666-16471 Tabriz, Iran
| | - Leila Sadeghi
- Department of Biology, Faculty of Natural Sciences, University of Tabriz, 51666-16471 Tabriz, Iran.
| | - Gholamreza Dehghan
- Department of Biology, Faculty of Natural Sciences, University of Tabriz, 51666-16471 Tabriz, Iran.
| | - Nader Sheibani
- Department of Ophthalmology and Visual Sciences, University of Wisconsin School of Medicine and Public Health, Madison, WI 53705, USA
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Sebold AJ, Ahmed AS, Ryan TC, Cohen BA, Jampel HD, Suskauer SJ, Zabel TA, Comi AM, Rybczynski S. Suicide Screening in Sturge-Weber Syndrome: An Important Issue in Need of Further Study. Pediatr Neurol 2020; 110:80-86. [PMID: 32660870 DOI: 10.1016/j.pediatrneurol.2020.03.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 02/17/2020] [Accepted: 03/08/2020] [Indexed: 12/28/2022]
Abstract
BACKGROUND Sturge-Weber syndrome is a neurocutaneous disorder associated with epilepsy, glaucoma, cognitive impairments, and a port-wine birthmark. Although individuals with Sturge-Weber syndrome are vulnerable to known risk factors for suicide, including chronic illness and physical differences (port-wine birthmark), frequency of suicidal ideation and attempts, and the clinical factors associated with suicide risk, in patients with Sturge-Weber syndrome is unknown. METHODS As a part of routine hospital practice, all outpatients aged eight years and older underwent suicide risk screening during nursing triage using a standardized suicide screening tool. Suicide risk screening results, demographic variables, and medical history (as available) for patients with Sturge-Weber syndrome (N = 34; median age = 15.5; range = 8 to 47 years, 44% male) and other neurological conditions seen at the same institution (N = 369; median age = 14; range = 8 to 78 years, 66% male) were used for retrospective within- and between-group analysis. RESULTS In the combined sample of Sturge-Weber syndrome and neurologically involved patients, a positive suicide risk screen was related to Sturge-Weber syndrome diagnosis (P = 0.043); analysis by sex showed increased risk of Sturge-Weber syndrome diagnosis in males (P = 0.008), but not in females. Within the Sturge-Weber syndrome group, use of a selective serotonin reuptake inhibitor (P = 0.019) was related to a positive risk screen. CONCLUSION People with Sturge-Weber syndrome may be at greater risk of suicidal thoughts or behaviors than those with other neurological conditions. Further study of suicide risk in patients with Sturge-Weber syndrome is needed.
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Affiliation(s)
- Alison J Sebold
- Neurology, Hugo Moser Kennedy Krieger Research Institute, Baltimore, Maryland
| | - Amelia S Ahmed
- DeBusk College of Osteopathic Medicine, Lincoln Memorial University, Harrogate, Tennessee
| | - Taylor C Ryan
- Johns Hopkins University, School of Public Health, Baltimore, Maryland
| | - Bernard A Cohen
- Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, Maryland; Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Henry D Jampel
- Glaucoma Center of Excellence, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Stacy J Suskauer
- Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, Maryland; Kennedy Krieger Institute, Baltimore, Maryland; Johns Hopkins University School of Medicine, Departments of Physical Medicine and Rehabilitation, Baltimore, Maryland
| | - T Andrew Zabel
- Department of Neuropsychology, Kennedy Krieger Institute, Baltimore, Maryland; Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Anne M Comi
- Neurology, Hugo Moser Kennedy Krieger Research Institute, Baltimore, Maryland; Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, Maryland; Department of Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland.
| | - Suzanne Rybczynski
- Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, Maryland; Department of Pediatric Rehabilitation Medicine, Kennedy Krieger Institute, Baltimore, Maryland
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