Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Early Experiences Accelerate Maturation of the 24-Hour Adrenocortical Rhythm

Robert Ader
Science
New Series, Vol. 163, No. 3872 (Mar. 14, 1969), pp. 1225-1226
Stable URL: http://www.jstor.org/stable/1726560
Page Count: 2
  • More info
  • Cite this Item
Preview not available
Preview not available

Abstract

Rats reared under 12-hour alternating periods of light and dark were killed at times corresponding to the times at which the maximum or minimum plasma corticosterone concentrations occur in mature animals. The characteristic 24-hour adrenocortical rhythm was first observed in rats 21 to 25 days old. In rats handled or stimulated with electric shock, the rhythm developed as early as 16 days.

Page Thumbnails

  • Thumbnail: Page 
1225
    1225
  • Thumbnail: Page 
1226
    1226