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diff --git a/doc/tutorials/cognition/change_perception.pd b/doc/tutorials/cognition/change_perception.pd
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+#X text 88 83 this is a steady tone;
+#X text 81 41 steady or vibrato?;
+#X text 66 20 steady or vibrato?;
+#X text 85 219 <-- center pitch;
+#X text 79 168 <-- amount of change;
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+#X obj 278 125 comment 270 14 Times ? 0 0 0 0 Conscious processing
+of sound in the brain is actually quite slow. Yes \, the ear can perceive
+changes on the order of 0.05ms (20 \, 000Hz) \, but your brain is made
+consciously aware of these changes at a much slower rate. You can hear
+an example of this using a oscillating frequency. A slow change in
+the frequency of a tone is perceived as vibrato \, you can consciously
+hear the wavering pitch. As that change in frequency becomes faster
+\, you can no longer consciously hear the wavering pitch. Instead you
+perceive a steady tone.;
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