In a phone screen, one hello can be rated on this many personality traits

In 2014, 320 listeners judged 64 sub-second “hello” voices on one of 10 personality traits. PLOS ONE published the mass online rating experiment. But the catch for a phone screen is the timing: the listener may begin forming an impression before your first real answer.

The sound lasted about 391 milliseconds

The PLOS ONE paper said the vocal clips were short utterances of the word “hello.” Male voices averaged 391 ms, plus or minus 65.1 ms. Female voices averaged 390 ms, plus or minus 64.1 ms.

That is the uncomfortable part for a nervous caller. The word is ordinary. The window is tiny. Yet 320 participants still rated 64 voices on one of 10 personality traits, such as trustworthiness. The researchers described the clips as sub-second vocal utterances, not interview answers, speeches or full conversations. So the study isolates the sound of a greeting before content can do much work. For a job seeker, that makes the opening feel exposed: tone arrives before examples, work history or the prepared story.

A greeting can carry the first sound of confidence

In a call, your greeting carries the first audible sign of pace, hesitation, strain or ease. The PLOS ONE experiment used only “hello,” not a full answer. For many people, voice inflection is where nerves become audible.

The study did not say a hiring manager can know your character from one word. It did report that listeners in a 2014 online experiment rated a person after hearing a single sub-second vocal utterance. In a phone screen, that is the space before “tell me about yourself.”

Why can a video interview feel harsher?

A separate 2016 meta-analysis in Personnel Assessment and Decisions looked at interview medium across 12 studies, with 13 unique samples and N=1,557. It reported lower outcomes in technology-mediated interviews.

The paper gave two negative mean effect sizes: d=-.41 for interviewer ratings and d=-.36 for applicant reactions. The authors described both as moderate and negative. For a job seeker, the pressure can sit on both sides of the screen.

A worked example from the opening word

Take a candidate who joins a first-round video interview and says one tight “hello.” In the PLOS ONE voice work, the comparable male-voice clip averaged 391 ms, while the comparable female-voice clip averaged 390 ms.

Now place that opening inside the 2016 interview-medium finding. Across 12 studies and 13 unique samples, technology-mediated interviews had lower ratings and lower applicant reactions. The hello is short, but the format already carries measured friction.

Every number behind the short hello

The two papers answer different parts of the same job-interview feeling. PLOS ONE measured how quickly listeners rated a voice. Personnel Assessment and Decisions summarized what happened to ratings and reactions when interviews moved through technology.

The table also explains why a tight first word can stay in your head after the call. One paper puts personality ratings inside a sub-second hello. The other puts lower ratings and lower applicant reactions inside technology-mediated interviews.

What this means for you

If your hello sounds tight, do not treat it as proof that the interview is over. The PLOS ONE work says listeners rated voices quickly. It does not say one word decides a hiring outcome, and the interview meta-analysis reports averages across studies.

Give your opening word a small job. Before the call, say your greeting out loud once at a normal pace, then say the first sentence you want after it. On the call, breathe before answering, keep the greeting plain and move into the substance you prepared.