Socioeconomic status,value, and response to number

An experiment was designed to study the role of sensory; empirical, and motivational variables in number discrimination of coin or slug displays having equal luminance. It was found that groups of children, differentiated on the basis of economic status, social class, and availability of money but equated for knowledge of purchasing power of money, respond in identical fashion when the number of slugs or coins viewed is within the “span of attention,” i.e., when response is at a sensory level. Differences between groups of children appear when the number of coins (but not slugs) in a display are so many as to fall outside the child’s “span of attention,” thus requiring the additional utilization of a judgmental framework in ascertaining the “manyness” of a display. The less favored socioeconomic group coin estimates were significantly greater than those of the more favored. When response data are expressed as numerosity functions, the operation of motivational factors may be differentiated algebraically. A t a theoretical level, it appears that motivational and sensory explanations are both true, providing they are restricted to definite and appropriate ranges of stimulus number and type.