Tip of the Tongue States: Brown and McNeill's 1966 Test and Lorazepam

SPEAKER_1 (0:00)

Picture this, you're mid-sentence talking to a good friend, telling a story you've been eager to share all day. The momentum is building, you're getting to the punchline, and then bam, you hit a wall.

SPEAKER_2 (0:12)

Oh yeah, the absolute worst.

SPEAKER_1 (0:14)

Right, a simple word just completely escapes you. You know exactly what it means, you know it starts with the letter P, you can like practically taste the shape of the syllables, but it just will not cross your lips.

SPEAKER_2 (0:27)

Yeah, it's the mental equivalent of being stuck in a waiting room when you know the doctor is standing right behind the door. You're caught in this very specific psychological glitch.

SPEAKER_1 (0:36)

Which is incredibly frustrating.

So welcome to this deep dive. Today we're gonna unpack the science, the history and the neurological mechanics behind that exact feeling, the tip of the tongue phenomenon, which is clinically known as lethologica.

SPEAKER_2 (0:51)

Right, lethologica, it's a great word for it.

SPEAKER_1 (0:54)

It really is. We've gathered a detailed stack of source material on this, and our mission today is to figure out exactly what's misfiring in your brain when this happens, why it feels so intensely frustrating, and what it reveals about the hidden architecture of human memory.

SPEAKER_2 (1:09)

Well, before we get too deep into the mechanics under the hood, we really need to draw a hard line around what state we are actually discussing.

SPEAKER_1 (1:16)

Okay, lay it out for us.

SPEAKER_2 (1:17)

So a true tip of the tongue or, you know, TOT state is characterized by a failure to retrieve a word from memory, but it's combined with partial recall and this overwhelming, really physical sensation that retrieval is imminent.

SPEAKER_1 (1:31)

Let me stop you there, because the phrase failure to retrieve feels, I don't know, a bit too broad.

SPEAKER_2 (1:37)

How so?

SPEAKER_1 (1:38)

Like, is this the same mechanism as when I'm, say, scrolling through a streaming service, I see an actor's face, and I know I've seen them in a movie before, but I just cannot conjure a single detail about them. Or, you know, knowing that I know the capital of a specific state, but just not having access to it in that moment.

SPEAKER_2 (1:56)

Okay, no, the research classifies what you're describing right there as a FOK state, a feeling of knowing.

SPEAKER_1 (2:02)

Fuck.

SPEAKER_2 (2:02)

Yeah, and it operates on a completely different framework than a TOT state. A feeling of knowing is the sense that, even though the information is currently inaccessible, you could recognize it if you saw it.

SPEAKER_1 (2:14)

Oh, like a multiple-choice test.

SPEAKER_2 (2:16)

Exactly. It's the awareness that you could pick the correct answer out of a lineup.

SPEAKER_1 (2:20)

So a feeling of knowing is essentially this passive recognition waiting to happen, whereas the tip of the tongue state is an active production failure.

SPEAKER_2 (2:29)

Right.

SPEAKER_1 (2:30)

So FOK is, I'll know it when I see it, and TOT is, I am about to say it right now.

SPEAKER_2 (2:36)

That is the crucial distinction, yeah. You're estimating the likelihood of recognition with a FOK., but a tip of the tongue state is visceral. It's that immanent sensation that the word itself is like pushing against the door, about to step into your conscious speech.

And the source material actually shows these two states draw on entirely different networks in the brain. F.O.K.s just do not activate the same conflict detection circuitry that T.O.Ts do.

SPEAKER_1 (3:01)

That makes a lot of sense.

So if these two states are fundamentally different, when did science actually figure out how to separate them? Like, have human beings always just been staring into space, snapping our fingers trying to remember the word for a spatula?

SPEAKER_2 (3:15)

Pretty much, yeah. I mean, William James, who was one of the founding figures of psychology, he first documented this specific phenomenon way back in his 1890 text, The Principles of Psychology.

SPEAKER_1 (3:25)

Oh, wow, 1890

SPEAKER_2 (3:26)

Yeah.

He described that exact feeling of mild anguish and the tease of imminent recall. And then Sigmund Freud later theorized about it, assuming that unconscious, repressed thoughts and impulses were causing us to subconsciously block familiar words.

SPEAKER_1 (3:40)

Okay, that is so Freud. He somehow managed to make forgetting a grocery list sound like a repressed scandal.

SPEAKER_2 (3:46)

Classic Freud, right? Right.

SPEAKER_1 (3:49)

But I imagine modern psychology needed something a little more rigorous than Freud's assumptions to actually study this. I mean, how do you even test a spontaneous glitch in a controlled lab environment? You can't just command a subject to forget a word.

SPEAKER_2 (4:02)