Discrimination thresholds for high-frequency tones are much larger than for low-frequency tones. This is a problem for place theory because:

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Place theory suggests that different parts of the cochlea are activated by different frequencies of sound. If discrimination thresholds are larger for higher frequencies, according to place theory, this would imply that the auditory filters for these frequencies should have larger bandwidths to accommodate the poorer discrimination. However, this is not observed, indicating a discrepancy with the theory's predictions.

Discrimination Thresholds for High-Frequency Tones Are Much Larger Than for Low-Frequency