Accession Number : AD0468749
Title : JUNGLE VISION III. EFFECTS OF SEASONAL VARIATION ON PERSONNEL DETECTION IN AN EVERGREEN RAINFOREST
Descriptive Note : Research rept.
Corporate Author : ARMY TROPIC TEST CENTER APO MIAMI 34004
Personal Author(s) : Dobbins, D A ; Gast, M ; Kindick, C M
Report Date : May 1965
Pagination or Media Count : 50
Abstract : The study was conducted to determine whether there are sufficient changes in evergreen rainforest vegetation during the dry season to enable US soldiers to detect human targets more readily than is possible during the wet season. The determination was made by comparing the results of the present study with a similar one conducted at the same sites during the wet season. Eighteen US Infrantry soldiers, all with normal vision, each were presented 45 randomly appearing human targets dressed in standard Army field clothes. The observers, who had a 180 degrees field of search, attempted to detect each target and estimate the distance to the target. Noise arresters were used to eliminate auditory cues. In spite of higher illumination levels, observable qualitative changes in vegetation, and a severe dry season, there were no significant differences in target detectability between the two seasons. In fact, the results of the present study could have been predicted from the previous study. Reliability of the methodology is indicated by the reproducibility of results. The near limit of target detectability in an evergreen rainforest was between 100 and 115 feet. Eye-level vegetation appears to be the principal deterrent to target detection regardless of the season.
Descriptors : *HUMANS , *MILITARY PERSONNEL , CLIMATE , DETECTION , FORESTRY , ILLUMINATION , JUNGLES , OPTICAL IMAGES , PERFORMANCE(HUMAN) , PLANTS(BOTANY) , RAIN , SURFACE TARGETS , TARGET RECOGNITION , TROPICAL REGIONS , VISION
Subject Categories : Military Forces and Organizations
Military Operations, Strategy and Tactics
Distribution Statement : APPROVED FOR PUBLIC RELEASE