Figure 1:  Police siren sound waves (Doppler effect)

Credit: Zachary Wilson
Source: CK-12 Foundation
License: CC BY-NC 4.0

Figure 2: Ear Diagram

https://www.labxchange.org/library/items/lb:LabXchange:fd5b30db:html:1

Figure 3: Cochlea and frequencies added pictures and arrows

https://biology.stackexchange.com/questions/110745/where-in-the-cochlea-are-frequencies-below-200-hz-detected

Figure 4: Hair cells in cochlea: (changes: Added arrows, picture, and blurbs to diagram, removed keys)

Smith-Cortinez, N., Tan, A. K., Stokroos, R. J., Versnel, H., & Straatman, L. V. (2023). Regeneration of Hair Cells from Endogenous Otic Progenitors in the Adult Mammalian Cochlea: Understanding Its Origins and Future Directions. International Journal of Molecular Sciences, 24(9), 7840. https://doi.org/10.3390/ijms24097840, Figure 1

Figure 5: Auditory pathways

https://www.facebook.com/TBIOneLoveJJ/posts/the-auditory-pathwaythis-is-the-neural-route-sound-travels-from-the-to-the-allow/974538451460528

Figure 6: Before and after (Example of clear vs unclear pathways)

https://www.greenmountainclub.org/wp-content/uploads/2024/10/Flood-Guidance-2024-1100-x-732-px-1.png

Figure 7: Cochlear Implant example

https://www.aarp.org/health/conditions-treatments/cochlear-implants

 Figure 8: CI implant diagram

Zeng, F. G. (2004). Trends in cochlear implants. Trends in amplification, 8(1), 1-34.Figure 3

Figure 9: Hearing Aids example

https://hillsent.com.au/do-patients-use-their-hearing-aids/

Figure 10: Hearing Aid diagram

https://dev.nsta.org/evwebs/764h

Cited sources:

Abdi R., Anshu K., et.al. (2025, February 14). Developmental trajectory of sound localization and precision and localization abilities. 52^nd Annual scientific technology meeting of the American Auditory society, Scottsdale, Arizona