Abstract
Several years ago, Whitworth and Jeffress examined Bannister's generally overlooked contention of 1927 that low-frequency tonal stimuli with dichotic intensity differences could be lateralized in two places. They reported trading ratios for two, simultaneously heard, locations; one fell in the respectable range often found, but the more elusive location had a trading ratio as small as 0.3 μsec/dB, a smallness of magnitude rarely reported. They contrasted these small trading ratios to the larger ones typically found for clicks and suggested that more than one peripheral mechanism might be responsible. Several papers have hypothesized that the trading ratios found with clicks might be due to the delay of N1 as formed at the basal end of the cochlea, and those for tone on neural activation at the hair cell. Neither account discusses question of when do tones become clicks. The present paper explores this question by extending the Whitworth and Jeffress “two-place lateralization” phenomenon to cover both clicks and tones of several durations and rise times.
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