Effect of visual pattern restriction in early life on brain enzyme in the rat

Abstract

visual environment of the VP group consisted of a board painted with *-in.-thick alternating black and white stripes, while the visual field of the RVP group was restricted to a flat-white painted board. All Ss were individually housed in stainless steel cages with wire mesh fronts; the visual pattern boards were hung 12 in. in front of the cage racks. The overhead fluorescent illumination diffused light evenly over aIl cages, and lights were on throughout the experiment. The D group animals were raised in total darkness until 90 days of age. Ss in aIl conditions were on ad lib food and water and were never touched, nor were their cages removed throughout the experimental period (70 days), except when the animals were weighed and rated for emotionality at 55 days of age.