There are distinct differences in how different personality types tend to speak. This is the secret relationship between personality and the voice. 

Volume is an indicator for how loud you talk in general. Extraverted sensors have an attentive and energetic voice. Introverted sensors tend to stay around the midrange. Extraverted intuitives tend to have a faded speech style. Introverted intuitives tend to have a mellow voice.

Articulation is how we weave and compose our words and sentences. Typically, thinking and judging types tend to start softly and openly, but tend to end their sentences in a strong and Conclusive manner. This discourages people from asking questions. Feeling perceiving types on the other hand, start strong and honestly, but end in an open-ended manner, often with a silent question mark. 

Excuse the mess. Voice rhythm is a question of how our tone and intensity increases and decreases while we speak. For example, NJs tend to have an elaborate speech style. It sounds like you’re going somewhere with what you say. You slowly increase in intensity and then slowly fall. 

SJs on the other hand, have a rhythmical speech style. The rhythm increases and decreases in a predictable style. SPs have a grabbing rhythm, they catch you strongly in the beginning, and then fade out, and then catch you again, making you pay more attention. Finally, NPs have an irrythmical speech style, with quick and unpredictable increases and decreases as they speak. 



Emotionality is a question of how much emotion you can convey with your voice. EFs tend to seem affectionate, and enthused and engaged with what they say on an emotional level. ITs seem completely distant to their own words and what they say. IFs seem emotional and warm, yet distant from their own words. ETs seem engaged with what they say, yet emotionally distant from it.