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Now, we also had--
this is another review.
We also had the example of a
psychophycial tuning curve.
So this is a normal
psychophysical tuning curve.
Can somebody explain to
me what the paradigm is?
A psychophysical
tuning curve, it's
taken from a human
listener, right?
What's the paradigm?
We had this in class, so we
should all know what this is.
A psychophysical tuning
curve, you have a probe tone.
I think that, in this
case, the probe tone
is right at the
tip of the arrow.
And the subject is instructed
to listen to the probe tone
and say when you
hear the probe tone.
Give the probe tone.
Yes, I hear that definitely.
Give it again.
Oh, yes, I hear that.
No problem.
Then, you add a second tone,
maybe a little bit higher
in frequency than
the probe tone.
Probe tone was-- let's say,
in this case, 1 kilohertz.
The second tone, masker tone
is 1.5 kilohertz, let's say.
Introduce that.
Person, yeah, I still
hear the probe tone.
I hear this other tone too.
Oh, don't pay attention to that.
Just listen to the probe tone.
Sure, I hear that.
Then, you boost the level
of that second masker tone
up to, in this case, 90 dB.
The person says, I can't
hear that probe tone anymore.
Can you turn it up?
And you plot that on your graph.
That's a hit.
That's a point.
In that case, the masker has
made inaudible the probe.
And you go on varying your
frequencies and levels
until that masker masks
the probe and the person
says I can't hear