The
Effect of Tone Frequency on Successive Comparison of Brightness
J. Kuze |
There
are three former studies dealing with tone effects on successive
comparison of brightness (SCB), considered as a kind of intersensory
interaction. These studies found contradictory results of tone effects
(facilitation, no effect, and inhibition). The present study examines
the assumption that tone frequency difference may cause the above
contradiction. As sensory interaction among senses is small and fragile,
the most effective conditions of tone stimuli (timing and intensity)
on SCB were searched for a start, and then the effects of tone frequency
on SCB were investigated by using these effective conditions. The
timing of auditory stimuli (1000 Hz, 80 dB pure tone) was varied
in Experiment 1 and the tones were presented "just before", "synchronically
with", and "just after" the visual stimulus. In Experiment
2, three intensities (40, 60, and 80 dB) of auditory stimuli were
scrutinized. Then, using these conditions (80 dB pure tone presented
synchronically with the visual stimulus), the frequency effects were
examined in Experiment 3. The assumption was partly confirmed; high
frequency tones facilitate brightness and middle frequency tones
show no effects but no inhibition was found, and another cause of
the contradiction, individual difference, was suggested.
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