تاثير آلودگي صوتي بر اكتساب و يادداري يك تكليف حافظه فضايي در بافت تمرين _ آزمون همسان و غيرهمسان در موش هاي نر بالغ

The Effect of Noise on Acquisition and Retention of a Spatial Memory Task in Equal and Unequal Context in Mature Male Rats

In this study, we examined the effects ofnoise on acquisition and retention of a spatial memory task in equal and unequal context in mature male rats. Subjects consisted of22 mature male rats placed in 3 groups randomly (group A: 8 , group B: 7 and group C : 7). The natural noise acquired in Azadi football stadium was used in surface of water maze system and was regulated in 2 intensities: High intensity (86 db) and Middle intensity (64 db) using SLM instrument. At first, we examined visual and memory systems of rats by visual and probe tests respectively. In the experiment, rats practiced a spatial memory task (water ma..e) in 4 trials , s blocks and 3 days of training program. Evaluation ofacquisition was in the end ofpractice. and for retention was after 72 hours in equal and unequal situations. Then we recorded data about delay time and used ANOIA test for analy..ing data in SPSS12. We showed a significant decrease in acquisition and retention among groups with an increase in intensity of noise. Also delay time increased with an increase in intensity of noise. Furthermore, the group trained in middle intensity had better delay time rather titan the group trained in silence (group A) in transmission test with higlt intensity.