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2015 ; 47
(1
): 45-52
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Tachistoscopic illumination and masking of real scenes
#MMPMID24519496
Chichka D
; Philbeck JW
; Gajewski DA
Behav Res Methods
2015[Mar]; 47
(1
): 45-52
PMID24519496
show ga
Tachistoscopic presentation of scenes has been valuable for studying the emerging
properties of visual scene representations. The spatial aspects of this work have
generally been focused on the conceptual locations (e.g., next to the
refrigerator) and directional locations of objects in 2-D arrays and/or images.
Less is known about how the perceived egocentric distance of objects develops.
Here we describe a novel system for presenting brief glimpses of a real-world
environment, followed by a mask. The system includes projectors with mechanical
shutters for projecting the fixation and masking images, a set of LED floodlights
for illuminating the environment, and computer-controlled electronics to set the
timing and initiate the process. Because a real environment is used, most visual
distance and depth cues can be manipulated using traditional methods. The system
is inexpensive, robust, and its components are readily available in the
marketplace. This article describes the system and the timing characteristics of
each component. We verified the system's ability to control exposure to time
scales as low as a few milliseconds.
free
free
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