### Collection Procedure Voice recordings will be collected to measure acoustic parameters of the voices, e.g. fundamental and formant frequencies. Participants will provide separate informed written consent regarding the use of their voice recordings. Voice recordings will be collected using a M-Audio Audio Buddy 2-channel preamp and an Audio-Technica AT4041 Cardiod Condenser microphone, at a sampling rate of 44.1kHz and 32-bit stereo amplitude quantization (see Figure 1 for settings). The computer software used to collect the voice recordings is ‘Audacity’ (version 2.0.5) (see Figures 2 and 3 for settings). The participants will be positioned at a distance of 30cm from the microphone and will be instructed not to lean into the microphone when speaking. Thereafter, the experimenter explains which voice recordings will be collected. ### Voice Recording Stimuli 1. **Vowels** as used in O'Connor et al. (2014) "AH" as in Father "EE" as in Beat "EH" as in Wet "OH" as in Low "OO" as in Boot "IH" as in His 2. First paragraph of the **Rainbow Passage** Fairbanks (1960) as used in Feinberg et al. (2012) "When the sunlight strikes raindrops in the air, they act as a prism and form a rainbow. The rainbow is a division of white light into many beautiful colours. These take the shape of a long round arch, with its path high above, and its two ends apparently beyond the horizon. There is, according to legend, a boiling pot of gold at one end. People look, but no one ever finds it. When a man looks for something beyond his reach, his friends say he is looking for the pot of gold at the end of the rainbow." 3. **Telephone scenario 1** as used in McAleer, Todorov, and Belin (2014) "Emma is reading a book in her room. Suddenly, the phone rings, “Hello?!” she answers in a curious voice. What a surprise to hear the voice of her friend who had been gone on a road trip for the last 4 months." 4. **Telephone scenario 2** As I sat in my room, suddenly the phone rang. The voice said: ‘Hello. This is your lecturer. I urge you to submit your essay by the end of the week.’ What a surprise it was to receive such a call on a Sunday night!" The participant is given time to read through everything and familiarize themselves with the passages which will be presented in front of them. Then, the participant is asked to say 'testing 1 2 3' into the microphone to give the experimenter the opportunity to adjust the volume of the recording to avoid clipping and ensure the consistency of voice recordings. Next, the participant is asked to read the vowels on the wall in front of them twice through, leaving a pause between each vowel. Next, the participant will be asked to read out the Rainbow passage once, and each of the two telephone scenarios in a neutral voice. If there is any disruption in the recording, e.g. laughter, coughing or mistake in pronunciation, the participant will be asked to read the passage out loud again. Then, the voice recordings will be digitally encoded as waveform audio files (Figure 4). ### Pre-Analysis Plan The voice recordings will be cut into segments, which will be measured for fundamental frequency and formant frequency using PRAAT software (V6.0.22; default settings unless stipulated, http://www.praat.org), following methods used in McAleer, Todorov, and Belin (2014). ---- ### References Fairbanks, G. (1960). The rainbow passage. Voice and articulation drillbook, 2. Feinberg, D. R., DeBruine, L. M., Jones, B. C., Little, A. C., O’Connor, J. J., & Tigue, C. C. (2012). Women's self-perceived health and attractiveness predict their male vocal masculinity preferences in different directions across short-and long-term relationship contexts. *Behavioral Ecology and Sociobiology, 66*(3), 413-418. McAleer, P., Todorov, A., & Belin, P. (2014). How do you say 'Hello'? Personality impressions from brief novel voices. *PloS ONE, 9*(3), e90779. doi:10.1371/journal.pone.0090779 O'Connor, J.J., Jones, B. ., Fraccaro, P.J., Tigue, C.C., Pisanski, K., & Feinberg, D.R. (2014). Sociosexual attitudes and dyadic sexual desire independently predict women's preferences for male vocal masculinity. *Archives of Sexual Behavior, 43*(7), 1343-1353. doi:10.1007/s10508-014-0298-y