It is actually quite early, if it is directly taught to infants.  My son was able to distinguish basic level colors at 18 months:<br><br><span style="font-size:12.0pt;mso-bidi-font-size:10.0pt;
font-family:Courier;mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:
"Times New Roman";color:black;mso-ansi-language:EN-US;mso-fareast-language:
EN-US;mso-bidi-language:AR-SA"><font size="2">(http//<a href="http://childes.psy.cmu.edu/win/english/feldman.zip">childes.psy.cmu.edu/win/english/feldman.zip</a>).<br><br>Dr. Andrea Feldman, Senior Instructor<br>University of Colorado at Boulder<br>
317 UCB, ENVD Bldg.<br>Program for Writing and Rhetoric Boulder, CO 80309-0317<br>303-492-4396<br>FAX 303-492-7877 <a href="mailto:feldman@spot.colorado.edu">feldman@spot.colorado.edu</a></font><br><br></span><br><div class="gmail_quote">
On Thu, Nov 3, 2011 at 7:49 PM, Lorraine McCune <span dir="ltr"><<a href="mailto:mccune@rci.rutgers.edu">mccune@rci.rutgers.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
I remember giving this information to my daughter some years ago when her daughter was about 18 months old. She promptly taught my granddaughter to name the color pink. She reliaby discriminated pink and non-pink. I so not remember what happened afterward! A niece learned "yellow" as a first color word at about three. For a long time all color questions were answered with "yellow"!<br>

<br><div class="gmail_quote">On Wed, Nov 2, 2011 at 4:07 PM, suse <span dir="ltr"><<a href="mailto:sgrass@gmx.net" target="_blank">sgrass@gmx.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

dear colleagues,<br>
i am setting up an experiment in which i want to use children's naming of certain aspects of an object as dependent variable.<br>
could someone by any chance tell me at which age children are able to reliably (!) name 3-6 basic colours? i kind-of remember that it is surprisingly late...<br>
<br>
thanks a lot indeed,<br>
Susanne<br><font color="#888888">
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</font></blockquote></div><br><br clear="all"><br>-- <br>Lorraine McCune, EdD<br>
Chair, Department of Educational Psychology<br>
Graduate School of Education<br>
Rutgers University<br>
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