Research index·Journal articleBehavioral SciencesScience News·4 Oct 1969NobleIDark:/48914/w1/20260515/5185C6E4DOI10.2307/3954528Journal articleBehavioral SciencesScience News · 1969 · SubscriptionNobleIDark:/48914/w1/20260515/5185C6E4DOI10.2307/3954528ReadRead at the publisherSaveCiteAdd to literature reviewPaywalledThe full text is at the publisherOpen it at the publisher to read it.Read at the publisherDiscussionAdd to the discussionTopicsPsychologyRelated papersMoreDetailsPublished, publisher, issueSuggest a correction or report