Further support for the wearout explanation is found in a tachistoscope
study on warnings (Fischer et al., 1993).
During fixation on the point at the centre of the tachistoscope
's screen, the concavity of the eyeballs ensures that the light from the right half of the screen strikes the left hemiretinae of both eyes, fibres from which join at the optic chiasm to project back to Brodmann's area 17 (primary visual cortex) of the left, speaking brain: this is what enables the patient to say he saw the word OR.
Without a tachistoscope
, movies and video can't achieve the short projection durations that subliminal advertising requires.
Air Force active-duty and reserve fighter pilots and showed them these images by tachistoscope
for 5 s.
For instance, Smith, Tremmel, and Honorton (1976) conducted a ganzfeld study whereby the sender viewed the target either outside of awareness (i.e., through a tachistoscope
for 1 ms) or continuously for a period of 10 min.
The stimuli and mask were presented via a four-field Gerbrands tachistoscope
driven by an IBM compatible computer (AT) which also registered responses made by pressing one of two buttons for either left or right, under the index finger of both hands.
W.) in a dimly lit sound-attenuated room and responded to a measure of subliminal perception that involved looking into a modified tachistoscope
at a number of slides that were presented at levels of illumination designed to be sufficiently low that participants reported no awareness of slide contents.
A three-field projection tachistoscope
and three Kodak SAV 2050 projectors were used to present the stimuli.
An IBM-compatible computer controlled a Kodak 850H slide projector equipped with a Lafayette Instrument Company 41010 lens tachistoscope
. Each 35-mm slide, showing one vehicle image from one viewpoint, was rear-projected onto a screen 46 cm from the subject's eyes.
found that sheep were more likely than goats to attempt an identification of a degraded picture presented against a background pattern of dots in a tachistoscope
and that they were more likely than goats to make an erroneous identification.
Each of the stimuli were mounted on card and presented via a two-field tachistoscope
(CET2, Colne Instruments Co.