Table of Contents
Scholarly Research Exchange
Volume 2009, Article ID 840620, 6 pages
Research Article

Impairment of Spatial Performance by Environmental Noise

1Sport Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran
2Department of Physiology & Pharmacology, Pasteur Institute of Iran, Pasteur ave, Tehran 13164, Iran
3Audiology Department, Faculty of Rehabilitation Sciences, IRAN University of Medical Sciences, Tehran, Iran
4Faculty of Physical Education & Sport Sciences, Tehran Branch of Islamic Azad University, Tehran, Iran
5Faculty of Physical Education & Sport Sciences, Tarbiat Mo'allem University of Tehran, Tehran, Iran

Received 18 June 2008; Revised 23 December 2008; Accepted 11 January 2009

Copyright © 2009 Mohammad Ali Gheraat et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We examined the effects of noise on acquisition and retention of the spatial memory task in equal and unequal context in adult male rats. The natural noise in Azadi football stadium was recorded and measured by sound level meter instrument and set in high (HI), moderate (MI), and low (LI) intensities, 86, 64, and 47 decibels A (dbA), respectively. Rats were trained in Morris water maze (MWM) for 3-consecutive-day program and at day 4 visible and probe tests were done under one of the above noise intensities. The retention was evaluated at day 7 on the basis of equal and unequal noise exposure situation. Escape latency, traveled distance, and swimming speed were recorded and used for subsequent analysis. Our results showed significant increases in the escape latency and traveled distance by increasing the noise intensity during acquisition period, and also retention test in equal noise situation. Furthermore, retention test in the group that was under HI noise during both training period and retention test escape latency and traveled distance compared to the groups which was under HI noise during training period and LI or MI noise during retention test (HI-LI or HI-MI).