## Line Chart: Proportion of IPD > IPD_max vs. Frequency for Different Environments ### Overview The image is a line chart comparing the proportion of Interaural Phase Difference (IPD) exceeding the maximum IPD (IPD_max) across different frequencies for three environments: "Nocturnal nature", "Forrest walk", and "City center". The x-axis represents frequency in kHz, and the y-axis represents the proportion of IPD > IPD_max. ### Components/Axes * **X-axis:** Frequency [kHz]. Scale ranges from 0.2 to 1.0, with tick marks at 0.2, 0.4, 0.6, 0.8, and 1.0. * **Y-axis:** Proportion of IPD > IPD_max. Scale ranges from 0 to 0.45, with tick marks at 0, 0.15, 0.3, and 0.45. * **Legend:** Located in the top-right corner of the chart. * "Nocturnal nature" - Dashed black line * "Forrest walk" - Solid black line * "City center" - Solid gray line ### Detailed Analysis * **Nocturnal nature (Dashed Black Line):** * Trend: Initially high, decreases rapidly with increasing frequency. * Data Points: * At 0.2 kHz, the proportion is approximately 0.42. * At 0.4 kHz, the proportion is approximately 0.44. * At 0.6 kHz, the proportion is approximately 0.10. * At 0.7 kHz, the proportion is approximately 0.01. * **Forrest walk (Solid Black Line):** * Trend: Starts lower than "Nocturnal nature", decreases with increasing frequency. * Data Points: * At 0.2 kHz, the proportion is approximately 0.31. * At 0.4 kHz, the proportion is approximately 0.27. * At 0.6 kHz, the proportion is approximately 0.05. * At 0.7 kHz, the proportion is approximately 0.00. * **City center (Solid Gray Line):** * Trend: Starts between "Nocturnal nature" and "Forrest walk", decreases with increasing frequency. * Data Points: * At 0.2 kHz, the proportion is approximately 0.30. * At 0.4 kHz, the proportion is approximately 0.33. * At 0.6 kHz, the proportion is approximately 0.05. * At 0.7 kHz, the proportion is approximately 0.00. ### Key Observations * All three environments show a decreasing proportion of IPD > IPD_max as frequency increases. * "Nocturnal nature" consistently has the highest proportion of IPD > IPD_max across the lower frequency range (0.2 kHz to 0.6 kHz). * "Forrest walk" has the lowest proportion of IPD > IPD_max in the lower frequency range. * All three lines converge to approximately 0 at around 0.7 kHz. ### Interpretation The chart suggests that the proportion of IPD exceeding IPD_max is frequency-dependent and varies across different environments. The "Nocturnal nature" environment exhibits a higher proportion of IPD > IPD_max at lower frequencies compared to "Forrest walk" and "City center". This could be due to the specific soundscapes of these environments, with "Nocturnal nature" potentially having more low-frequency sounds that contribute to larger IPD values. The convergence of all lines to zero at higher frequencies indicates that the proportion of IPD exceeding IPD_max becomes negligible at these frequencies, regardless of the environment. This data could be relevant in understanding how different environments affect auditory processing and spatial hearing.

\n ## Line Chart: Proportion of IPD > IPD_max vs. Frequency ### Overview This image presents a line chart illustrating the proportion of Interaural Phase Difference (IPD) exceeding the maximum IPD (IPD_max) across different frequency ranges for three distinct environments: Nocturnal nature, Forrest walk, and City center. The chart aims to compare how sound localization cues vary in these environments. ### Components/Axes * **X-axis:** Frequency [kHz], ranging from approximately 0.2 kHz to 1.0 kHz. The axis is labeled "Frequency [kHz]". * **Y-axis:** Proportion of IPD > IPD_max, ranging from 0.0 to 0.45. The axis is labeled "Proportion of IPD > IPD_max". * **Legend:** Located in the top-right corner of the chart. * Nocturnal nature: Represented by a dashed black line. * Forrest walk: Represented by a solid black line. * City center: Represented by a light gray shaded area. ### Detailed Analysis The chart displays three curves representing the proportion of IPD exceeding IPD_max for each environment as a function of frequency. * **Nocturnal nature (dashed black line):** This line initially starts at approximately 0.36 at 0.2 kHz, rises to a peak of approximately 0.43 at around 0.38 kHz, and then declines, crossing 0.15 at approximately 0.65 kHz and approaching 0 at 0.8 kHz. * **Forrest walk (solid black line):** This line begins at approximately 0.28 at 0.2 kHz, gradually decreases to approximately 0.18 at 0.4 kHz, and then rapidly declines, reaching approximately 0.05 at 0.6 kHz and approaching 0 at 0.7 kHz. * **City center (light gray shaded area):** This area starts at approximately 0.30 at 0.2 kHz, remains relatively stable until approximately 0.4 kHz, and then gradually decreases, reaching approximately 0.10 at 0.6 kHz and approaching 0 at 0.8 kHz. The shaded area represents a range of values, indicating variability within the City center environment. ### Key Observations * The Nocturnal nature environment exhibits the highest proportion of IPD > IPD_max, particularly in the lower frequency range (0.2 - 0.4 kHz). * The Forrest walk environment consistently shows the lowest proportion of IPD > IPD_max across all frequencies. * The City center environment falls between the Nocturnal nature and Forrest walk environments, with a relatively stable proportion in the lower frequencies and a gradual decline as frequency increases. * All three environments show a general trend of decreasing proportion of IPD > IPD_max as frequency increases. ### Interpretation The data suggests that sound localization cues, as indicated by the proportion of IPD exceeding IPD_max, are most prominent in the Nocturnal nature environment and least prominent in the Forrest walk environment. This could be due to differences in sound reflection and absorption characteristics of these environments. The City center environment, with its complex soundscape, exhibits intermediate characteristics. The decline in IPD proportion with increasing frequency across all environments is consistent with the physics of sound wave propagation. Higher frequencies have shorter wavelengths and are less susceptible to interaural time differences, which are the basis of IPD. The variability represented by the shaded area for the City center environment likely reflects the diverse sound sources and acoustic conditions present in urban settings. This data could be used to inform the design of virtual auditory environments or to understand how humans perceive sound in different real-world settings. The peak in Nocturnal nature suggests a specific frequency range where sound localization is most effective in that environment.

## Line Graph: Proportion of IPD > IPD_max vs Frequency [kHz] ### Overview The graph displays three frequency-dependent trends in the proportion of IPD (Interaural Phase Difference) exceeding a maximum threshold (IPD_max) across three environments: Nocturnal nature, Forrest walk, and City center. The y-axis represents the proportion (0–0.45), and the x-axis represents frequency (0.2–1 kHz). All lines converge near 0.8 kHz, suggesting a shared attenuation pattern at higher frequencies. ### Components/Axes - **Y-axis**: "Proportion of IPD > IPD_max" (0 to 0.45, linear scale). - **X-axis**: "Frequency [kHz]" (0.2 to 1, linear scale). - **Legend**: Located in the top-right corner, with three entries: - Dashed line: Nocturnal nature - Solid black line: Forrest walk - Solid gray line: City center ### Detailed Analysis 1. **Nocturnal nature (dashed line)**: - Starts at ~0.3 at 0.2 kHz. - Peaks at ~0.45 at ~0.4 kHz. - Declines sharply to ~0.1 at ~0.6 kHz. - Drops to near 0 by 0.8 kHz. 2. **Forrest walk (solid black line)**: - Begins at ~0.25 at 0.2 kHz. - Peaks at ~0.35 at ~0.3 kHz. - Declines to ~0.15 at ~0.5 kHz. - Reaches ~0.05 at 0.8 kHz. 3. **City center (solid gray line)**: - Starts at ~0.3 at 0.2 kHz. - Peaks at ~0.3 at ~0.35 kHz. - Declines to ~0.1 at ~0.5 kHz. - Drops to ~0.02 at 0.8 kHz. ### Key Observations - **Nocturnal nature** exhibits the highest initial proportion and widest frequency range before attenuation. - **Forrest walk** and **City center** show similar peak proportions (~0.35 and ~0.3, respectively) but differ in frequency of peak occurrence. - All lines converge near 0.8 kHz, indicating a shared threshold for IPD_max attenuation across environments. - Nocturnal nature’s peak (~0.45) is ~50% higher than Forrest walk’s peak (~0.35). ### Interpretation The data suggests that **Nocturnal nature** environments produce more variable or extreme IPD values compared to urban or forested settings. The sharp decline in all lines after ~0.5 kHz implies that higher frequencies are less likely to exceed IPD_max thresholds, possibly due to environmental noise masking or sound attenuation mechanisms. The City center’s flatter initial slope may reflect consistent anthropogenic noise, while the Forrest walk’s earlier peak could indicate natural sound variability (e.g., wind, animal activity). The convergence at high frequencies highlights a universal acoustic property across environments, potentially relevant for auditory perception studies or noise pollution modeling.