Science Behind Repeating Yourself While Wearing a Mask
How many times do you have to ask someone to repeat themselves with a mask on? And how many times have you seen someone pull their mask down to speak in public, instilling fear in the person next to them? It’s a unique time for everyone. Anyone that’s had to order food at a counter, with plexi-glass between staff and customers, and sizzling food/music coming from (Cava’s) speakers understands… our auditory system and attention really gets tested in public now.
When we have our masks on; the audibility and clarity of speech is impacted, and being 6 feet away from others doesn’t help. But there’s obviously a reason behind why we wear them;
“Let's consider a little primer on virology and the policies necessary to mitigate the spread of COVID-19. The unique characteristic of this virus is the route of transmission via small droplets ejected from the mouth. The droplets are expelled when a person with COVID-19 coughs, sneezes, or speaks. Interestingly, speaking actually produces more droplets than does coughing (Chao et al., 2009), and louder speech creates a relatively larger quantity of droplets than does softer speech (Anfinrud, Bax, Stadnytski, & Bax, 2020). When a person speaks, he or she releases nearly 200 viral particles per minute! Thus, it would take five minutes of speaking face to face to receive the dose of particles to readily infect a conversation partner.” (Dr. Barbara Weinstein, PhD)
Now with Applied Speech Acoustics: For every doubling of the distance from the sound source in a free field situation, the sound intensity will diminish by 6 decibels.
“Smply” put: sound diminishes by approximately 6 dB for each doubling of distance.
For example: if you are 2' away from someone who is speaking and move to 4' away, the person's voice will be reduced by 6 dB.
So, health care providers' communication with patients, restaurant staff, daycare staff... will be negatively impacted because of both the social distancing and masking requirements.
The other factor is that the mask reduces airflow. Typically, when we can’t hear someone, we compensate; as I typically do… we read lips. Impossible to do with the masks. Also, low-frequency vowel sounds are easiest to hear because they are higher in intensity. Consonant sounds are higher in frequency and lower in intensity, and so they are more difficult to identify. So, the consonant sounds which are both weak in intensity and high in frequency are difficult to hear (e.g. /p/), especially without the visual cue of lip reading.
Basically; there’s a science to why we can’t hear each other with our masks on, we’re all just adapting to the times. There’s also this available; The Communicator TM Surgical Mask with a Clear Window (Model FM86000) manufactured by Safe N’Clear is a patented FDA registered device that meets ASTM F2100 Level 1 protection surgical mask standards. https://safenclear.com/product/the-communicator-surgical-mask-with-a-clear-window/
Tips for Families and those working with children:
https://www.aota.org/~/media/Corporate/Files/Practice/back-to-school/Tips-for-Families.pdf
https://www.aota.org/~/media/Corporate/Files/Practice/back-to-school/Masks-and-Facial-Coverings.pdf
For more information, schedule a free consult with our team!
