Signal Lab

Open review

Signal Lab

What your pen said, every 10 seconds

The four hesitation signals Inkling reads from your handwriting in Calculus I — The Chain Rule (demo), the score they add up to, and the line a window has to cross to be flagged. Hover or use the arrow keys for the details; select a spike to open that moment.

Spikes flagged
1
Highest score
0.62
at 04:20
Baseline measured
120 s
your normal
Windows scored
24
of 36

Smoothed scoreRaw score (this window only)Spike thresholdSpike — click to open the momentSignal on (≥ 0.40)Baseline
Hesitation signals for Maya — Session 1, per 10-second window over 06:00 of lecture: 1 spike above the 0.55 threshold; highest score 0.62 at 04:20.
Lecture timePhasePauseSlowdownErasePressureRaw scoreSmoothed scoreSpikeReasons
00:00–00:10baseline0.000.020.00n/a0.010.00no
00:10–00:20baseline0.000.020.00n/a0.010.01no
00:20–00:30baseline0.000.070.00n/a0.020.01no
00:30–00:40baseline0.000.010.00n/a0.000.01no
00:40–00:50baseline0.000.000.00n/a0.000.00no
00:50–01:00baseline1.000.000.00n/a0.350.18nopaused 4s while 19 words were spoken
01:00–01:10baseline1.000.001.00n/a0.650.41nopaused 8s while 24 words were spoken; erased 1× (usual 0.0)
01:10–01:20baseline1.000.000.00n/a0.350.38nopaused 5s while 19 words were spoken
01:20–01:30baseline0.000.000.00n/a0.000.19no
01:30–01:40baseline0.000.030.00n/a0.010.10no
01:40–01:50baseline0.000.001.00n/a0.290.20noerased 1× (usual 0.0)
01:50–02:00baseline1.000.000.00n/a0.350.28nopaused 8s while 23 words were spoken
02:00–02:10scored1.000.000.00n/a0.350.31nopaused 4s while 21 words were spoken
02:10–02:20scored1.000.050.00n/a0.370.34nopaused 7s while 23 words were spoken
02:20–02:30scored0.000.030.00n/a0.010.18no
02:30–02:40scored0.000.000.00n/a0.000.09no
02:40–02:50scored1.000.020.00n/a0.360.22nopaused 9s while 23 words were spoken
02:50–03:00scored1.000.010.00n/a0.360.29nopaused 1s while 19 words were spoken
03:00–03:10scored1.000.000.00n/a0.350.32nopaused 10s while 23 words were spoken
03:10–03:20scored1.000.010.00n/a0.360.34nopaused 4s while 20 words were spoken
03:20–03:30scored1.000.000.00n/a0.350.35nopaused 9s while 19 words were spoken
03:30–03:40scored0.000.000.00n/a0.000.17no
03:40–03:50scored0.000.010.00n/a0.000.09no
03:50–04:00scored0.000.010.00n/a0.000.05no
04:00–04:10scored1.000.630.00n/a0.580.31nopaused 6s while 19 words were spoken; writing 63% slower than usual
04:10–04:20scored1.000.641.00n/a0.870.59yespaused 3s while 21 words were spoken; writing 64% slower than usual; erased 1× (usual 0.0)
04:20–04:30scored1.000.001.00n/a0.650.62nopaused 10s while 24 words were spoken; erased 1× (usual 0.0)
04:30–04:40scored1.000.000.00n/a0.350.49nopaused 10s while 24 words were spoken
04:40–04:50scored1.000.000.00n/a0.350.42nopaused 10s while 21 words were spoken
04:50–05:00scored0.000.000.00n/a0.000.21no
05:00–05:10scored1.000.040.00n/a0.370.29nopaused 5s while 23 words were spoken
05:10–05:20scored1.000.000.00n/a0.350.32nopaused 8s while 19 words were spoken
05:20–05:30scored0.000.000.00n/a0.000.16no
05:30–05:40scored1.000.000.00n/a0.350.26nopaused 10s while 20 words were spoken
05:40–05:50scored0.000.000.00n/a0.000.13no
05:50–06:00scored1.000.040.00n/a0.370.25nopaused 7s while 16 words were spoken

How Inkling decides you were stuck

  1. Learn your normalThe first 2 minutes of your own writing are your baseline. Nothing there is ever flagged — it is what the rest is compared against, so a slow writer isn't "stuck" just for being slow.
  2. Read four signals every 10 secondsEach signal is scaled from 0 (like your normal) to 1 (far from it), measured against your baseline — not against other students.
  3. Blend and smoothThe signals are blended by weight into a score, then smoothed with the previous window (50% new, 50% carried over) so one odd stroke can't set it off.
  4. Flag a spikeA window is flagged when the smoothed score reaches 0.55 and at least 2 signals are on (≥ 0.40) at once. Flags are at least 30 s apart, and at most 5 per session.
Pause30%
You stopped writing for 6 s or more while the lecturer kept talking.
Slowdown30%
Your pen moved slower than your own usual speed.
Erase25%
You erased more than you usually do.
Pressure15%
You pressed harder than usual (only with a pressure-sensitive pen).

Without a transcript the pause signal is off and its weight is shared by the others; without pen pressure the pressure weight is shared the same way.

How accurate is this? Model evaluation