Children trained in heightened sensory perception (HSP®) demonstrate the ability to utilise sensory information to correctly report the colour of cards without the normal amounts of visual sensory information. To examine this effect the current study attempted to test the effects of reducing the environmental luminance in 2 highly trained subjects. The cards were placed in a stand 30 cm from the subjects face and the subject wore a blindfold with a light penetration of less then 0.1%. The delivery of the card colour was in a random fashion so the subject could not count or predict what card would be coming next. A total of 10 cards (of 6 different colours) were delivered and this protocol was repeated 5 times (50 trials total). The subjects score was calculated as correct answer from 10 and averaged across the 5 trials. Subject data was then averaged for the 2 subjects. This protocol was then repeated with the lights turned off (reduced environmental luminance) so that the intensity of the stimulus was reduced. The results for these two conditions were then compared with the probabilities of guessing success and compared between conditions. The results suggest that the scores achieved during both conditions were greater than guessing probability alone, and also the intensity of stimulus was important for success of the performance. From these results we suggest that