IN a YouTube clip from one of Steve Jobs’s last interviews, he appears to be enjoying reminiscing about how he first hit upon the idea for the keyboardless tablet that eventually became the iPad.

“I had this idea of being able to get rid of the keyboard, type on a multitouch glass display and I asked our folks, could we come up with a multitouch display that I could type on, I could rest my hands on and actually type on,” Mr. Jobs says, smiling slightly as he recounts his enthusiasm at seeing the first prototype. “It was amazing.”

But in a billboard superimposed over the nearly two-minute video clip, an emotion analytics company called Beyond Verbal has added its own algorithmic evaluation of Mr. Jobs’s underlying feelings. It is an emotion detection system meant to parse not the meanings of people’s words, but the intonations of their voices.

“Conflict between urges and self-control. Loneliness, fatigue, emotional frustration,” the ticker above Mr. Jobs’s head reports as he speaks. Moments later, it suggests a further diagnosis: “Insistence, stubbornness. Possibly childish egoism.” And then concludes: “sadness mixed with happiness. Possibly nostalgia.”