Standardized README to Markdown format

README.md

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+- Note from the ModelDB Administrator:  The following paper and model are available from  
+  [Dr. Carney's web site](http://www.urmc.rochester.edu/labs/Carney-Lab/publications/auditory-models.cfm):  
+  from which the following is an excerpt.
+
+---
+
+Nelson and Carney - A phenomenological model of peripheral and central neural responses to amplitude-modulated tones. (JASA 116:2173-2186) Models for responses to Amplitude-Modulation at the AN, CN, and IC levels  
+
+The following article appeared in [*J. Acoust. Soc. Am.* Volume 116, Issue 4, pp. 2173-2186](http://link.aip.org/link/?JAS/116/2173)  
+
+[Nelson et al., JASA 2004 Manuscript](http://www.urmc.rochester.edu/labs/Carney-Lab/publications/res/NelsonCarney-JASA-2004.pdf) © Acoustical Society of America.  
+This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.  
+
+[Nelson et al., 2004 Model Code](http://www.urmc.rochester.edu/labs/Carney-Lab/publications/res/NelsonCarney-AMcode-2003.zip)
+
+---
+
+2025-06-02: Converted README to Markdown.