# animal control

**URL:** http://discourse.iapct.org/t/animal-control/13043
**Category:** CSG1999
**Created:** [June 17, 1999, 8:21pm UTC](http://discourse.iapct.org/t/animal-control/13043 "1999-06-17T20:21:40Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Bill\_Powers1](http://discourse.iapct.org/letter_avatar_proxy/v4/letter/b/8e7dd6/32.png) [@Bill\_Powers1](http://discourse.iapct.org/u/Bill_Powers1)
#### Post date: [June 17, 1999, 8:21pm UTC](http://discourse.iapct.org/t/animal-control/13043/1 "1999-06-17T20:21:40Z")

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[from Mary Powers 990617]

Rick -

I don't know if you are asking for data on the animal control list or  
CSGnet - but the 3-June-99 Nature has a paper (p.466) by A. Leonardo and M.  
Konishi: Decrystallization of adult birdsong by perturbation of auditory  
feedback.

"Crystallization" refers to the notion that once a young bird has learned  
its species' song, the song is stable for unknown reasons (called  
crystallization which implies that the song has somehow solidified in the  
brain). These two guys tried interfering with auditory feedback, and  
whaddaya know, the song deteriorated (oops, I mean decrystallized).  
Restoration of feedback -\> recovery of song. I quote: "Here we present  
evidence that auditory feedback is actively used in adulthood to maintain  
the stability of song structure".

Mary P.