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Hippocampal Lesions in Male Rats Produce Retrograde Memory Loss for Over-Trained Spatial Memory but Do Not Impact Appetitive-Contextual Memory: Implications for Theories of Memory Organization in the Mammalian Brain.
J Neurosci Res
January 2025
Canadian Centre for Behavioural Neuroscience, University of Lethbridge, Lethbridge, Alberta, Canada.
Article Synopsis
- The study investigates the role of the hippocampus (HPC) and amygdala in memory formation, particularly focusing on retrograde amnesia that occurs after HPC disruption.
- Findings reveal that damage to the HPC does not affect conditioned place preference (CPP) tasks, which rely on the basolateral amygdala, suggesting that not all learning tasks require HPC involvement.
- Additional experiments using the Morris water task indicate that while HPC damage impairs performance, other memory networks can't fully compensate when certain training methods are used, highlighting the complexity of memory processing.
Punctate Hippocampal Hyperintensities on Diffusion-Weighted Imaging Following Epileptic Seizures: A Case Report.
Cureus
November 2024
Department of Neurology, Hiroshima Citizens Hospital, Hiroshima, JPN.
Article Synopsis
- Punctate hippocampal hyperintensity (PHH) on diffusion-weighted imaging (DWI) is typically associated with transient global amnesia (TGA) but can also appear in other contexts, such as in a 56-year-old male after seizures.
- The patient experienced focal onset bilateral tonic-clonic seizures and exhibited bilateral PHHs in the CA1 regions of the hippocampus without showing TGA symptoms.
- This case suggests that PHH may have broader clinical significance beyond TGA, raising questions about the mechanisms behind its occurrence in epileptic events.
Anterograde versus Retrograde Effects of Damage to Identified Learning and Memory Systems during Acquisition, Retention, and Re-Acquisition of an Instrumental Visual Discrimination Task: Dorsal Striatum, Perirhinal Cortex, and Hippocampus.
J Integr Neurosci
November 2024
Canadian Centre for Behavioural Neuroscience, Department of Neuroscience, University of Lethbridge, Lethbridge, AB T1K 3M4, Canada.
Background: The goal of these experiments was to determine which learning and memory system(s) were necessary for the retention of visual discriminations and subsequent acquisition of a second problem. The dorsal striatum should be involved in the acquisition and expression of this task based on previous work implicating this region in instrumental learning and memory processes. The perirhinal cortex has been implicated in learning and memory processes associated with visual information like objects, and pictures and may also play a role in the acquisition and/or retention of visual discriminations.
View Article and Find Full Text PDFThe effects of treatment, clinical and demographic factors on recovery of orientation after ECT: A care network study.
J Affect Disord
January 2025
Discipline of Psychiatry and Mental Health, School of Clinical Medicine, University of New South Wales, Australia; Black Dog Institute, Australia.
Background: Time to reorientation after electroconvulsive therapy (ECT) has been shown to predict retrograde amnesia and is a useful measure for monitoring patients over the acute treatment course. This study investigated the effects of treatment, clinical and demographic factors on the recovery of orientation after ECT.
Methods: Data from 555 ECT patients across two different clinical CARE Network sites were analysed.
Associating sensory cues with incoming seizures: developing an animal model of auras.
Sci Rep
September 2024
Canadian Centre for Behavioural Neuroscience, University of Lethbridge, 4401 University Drive, Lethbridge, AB, T1K 3M4, Canada.
For patients with epilepsy, one of the biggest problems is the unpredictability of the time when the next seizure will occur. Interestingly, some epileptic patients experience a sensory sensation preceding seizures, called aura, which helps them move to safety before a seizure. Here, we describe the development of the first animal model of auras, which could allow for a more detailed study of this phenomenon.
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