Emily Spencer

Critics of the Implicit Association Test —a measure of the strength of a person’s automatic, memory-based association between two concepts, such as “black” and “threatening” or “white” and “caring”—have at least three main objections. Their symmetry argument is that the IAT should but does not give equally valid results for black-on-white and white-on-black racism. Their cultural-awareness argument is that the IAT illegitimately presupposes that use of racial stereotypes presupposes no stereotype acceptance, only stereotype awareness. Their completeness argument is that at best the IAT measures only questionable or implicit, not explicit, bias because IAT ignores the fact that subjects’ conscious desires to avoid bias often enable them to check their biased behavior. Examining each of these anti-IAT stances, the paper summarizes the IAT and then argues for 6 main claims. Clarifying concepts like racism is important for progress in social science. IAT critics’ SA presupposes an ahistorical/acultural concept of racism. IAT critics’ AA presupposes a linguistically-insensitive concept of racism, one presupposing that the language we use provides no behavioral evidence for racism. IAT critics’ CA presupposes a concept of racism subject to conscious, deliberate control. IAT proponents endorse a more plausible concept of racism, one that is contextual, linguistically sensitive, and often not susceptible to conscious control. Although the IAT debate is unsettled, IAT critics’ use of a questionable concept of racism gives grounds for doubting their claims.

The central drift chamber for the BaBar detector at the SLAC B-factory is based on a hexagonal cell design with 7104 cells arranged in 40 layers and drift gas Helium:isobutane. Performance optimization and integration requirements led to an electronics design that mounts the amplifier-discriminator and digitizing circuitry directly on the endplate. High channel density is achieved using a 4-channel custom amplifier-discriminator IC and an 8-channel custom CMOS TDC/FADC IC on a single circuit board. Data read from the front ends are multiplexed on 4 fiber optic links, and prompt trigger data are sent out continuously on 24 links. Analysis of cosmic ray data demonstrates that the electronics design meets the performance goals for the BaBar drift chamber. The final electronics were installed on the drift chamber in July, 1998. Installation of BaBar on beamline is scheduled for March, 1999. © 1999 IEEE.