Low harmonics are resolved in the excitation pattern but smear beyond the tenth harmonic.

Evidence

In the place model, the excitation pattern is used, which is a representation of the power at the output of the auditory filter bank. The excitation pattern in Figure 6–7 reveals the two possible place models: an excitation pattern peak at 100 Hz, and a representation of the integer-multiple harmonics in the low frequencies. Note that the low-frequency harmonics are resolved, meaning that their peaks are represented in the excitation pattern. We can see the peaks at 100, 200, and 300 Hz and so on. However, these peaks reduce in size as the frequency of the harmonics increase, due to the broadening of frequency selectivity with increasing frequency. At some point, around the 10th harmonic, we observe that the high frequency components are no longer resolved. The frequencies within the stimulus are so close together that their representations are smeared together. A complex place model that recognizes patterns would be capable of extracting the resolved frequencies present in the stimulus using the low-frequency filters. Using this information, the auditory system could calculate the greatest common frequency and determine the pitch. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1226

Categorization

Category: Factual Claims

• DEFINE: Defines the excitation pattern and the resolution of low-frequency harmonics in the place model.

Related

• The auditory system can extract pitch from resolved low-frequency harmonics using place patterns (similarity 0.94)
• Unresolved harmonics smear together as frequency rises (similarity 0.90)
• Only low-numbered harmonics are resolved, higher ones blur together in the internal representation (similarity 0.87)
• Resolved low-numbered harmonics are required to encode pitch by place (similarity 0.86)
• The ear’s frequency resolution worsens progressively at higher frequencies. (similarity 0.85)
• Place coding of fundamental pitch fails at high frequencies when harmonics smear together (similarity 0.83)
• Excitation patterns smooth the spectrum, blurring harmonic and formant detail the acoustic signal carries (similarity 0.82)
• Residue pitch is computed in the auditory cortex within a tenth of a second (similarity 0.82)
• Place coding poorly carries pitch when harmonics go unresolved. (similarity 0.82)
• Only the first five to seven harmonics are resolved by the ear’s place mechanism (similarity 0.81)
• Resolved harmonics use place pitch coding while unresolved harmonics use temporal coding (similarity 0.80)
• The existence region supports a place-based harmonic template model of pitch (similarity 0.80)
• Place code governs pitch perception of pure tones above about 4 to 5 kHz (similarity 0.80)
• The excitation pattern plots auditory-filter output power against filter center frequency (similarity 0.80)
• The excitation pattern is the internal representation of a stimulus spectrum (similarity 0.80)