Reactivation of an aversive memory modulates learning strategy preference in male rats
| Autor: | Jessica M. Patel, Kelly S. Hodges, Elin M. Grissom, Wayne R. Hawley, Gary P. Dohanich |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Male
medicine.medical_specialty Adult male Physiology education Hippocampus Striatum Anxiety Audiology behavioral disciplines and activities Training trial Developmental psychology Stress Disorders Post-Traumatic Behavioral Neuroscience Memory Male rats Avoidance Learning medicine Animals Rats Long-Evans Maze Learning Analysis of Variance Electroshock Endocrine and Autonomic Systems Stressor Recognition Psychology Rats Neostriatum Psychiatry and Mental health Neuropsychology and Physiological Psychology Space Perception medicine.symptom Psychology Hypoactivity Stress Psychological psychological phenomena and processes |
| Zdroj: | Stress. 16:73-86 |
| ISSN: | 1607-8888 1025-3890 |
| DOI: | 10.3109/10253890.2012.683466 |
| Popis: | Reminders of an aversive event adversely impact retrieval of hippocampus-dependent memories and exacerbate stress-induced levels of anxiety. Interestingly, stress and anxiety shift control over learning away from the hippocampus and toward the striatum. The aims of the current study were to determine whether spatial memory and learning strategy are impacted by reminders of a stressor. Adult male Long-Evans rats (N = 47) were subjected to an inhibitory avoidance (IA) training trial in which 32 rats were exposed (3 s) to a single inescapable electrical footshock (0.6 mA). Prior to the retention trial of a Y-maze task and the probe trials of two different learning strategy tasks, some of the rats that were exposed to the footshock (n = 17) were reminded of the stressor on an IA retrieval trial. Both groups of rats exposed to the initial stressor exhibited hypoactivity, but no impairment in spatial memory, on the Y-maze task conducted 1 week after exposure to the footshock. One month after exposure to footshock, both groups of rats exposed to the initial stressor tended to prefer a striatum-dependent learning strategy on a water T-maze task. However, 2 months after exposure to footshock, only shocked rats that were reminded of the stressor exhibited a preference for a striatum-dependent learning strategy on a visible-platform water maze task, which corresponded with lower levels of activity in an open field. The results indicate that reminders of a stressor perpetuate the deleterious effects of stress on affective and cognitive processes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|