Beneficence: Does Agglomeration Matter?

When it comes to the duty of beneficence, a formidable class of moderate positions holds that morally significant considerations emerge when one's actions are seen as part of a larger series. Agglomeration, according to these moderates, limits the demands of beneficence, thereby avoiding the extremely demanding view forcefully defended by Peter Singer. This idea has much appeal. What morality can demand of people is, it seems, appropriately modulated by how much they have already done or will do. Here we examine a number of recent proposals that appeal to agglomeration. None of them, we argue, succeeds.     

Contour deletion as a method for identifying the weights of features underlying object recognition

A prerequisite for comparative work on object recognition is a method for identifying the features actually extracted from the form. The method introduced here with pigeons is discrimination training between two simple line drawings, followed by a generalization test in which contour is deleted from the reinforced drawing. In Condition 1, the line drawings were a square (S+) versus a triangle (S-); for Condition 2, the line drawings were planar projections of a cube (S+) versus a truncated pyramid (S-). The generalization decrement between responses to S+ and responses to test stimuli provides a quantitative index of the weight assigned to each feature. Contour deletion at either vertices or midsegments produced a decrement in the rate of responding, showing that each contour was represented as a feature. The generalization decrement to forms containing vertices with midsegments deleted was larger than the generalization decrement to forms containing midsegments with vertices deleted. Therefore, it appears that midsegments are weighted more strongly as features than vertices. Contour deletion provides a direct method for identifying the visual features underlying object recognition and lays a foundation for the development of comparative theories of object recognition.