Objectives. To better understand the consequences of whole or partial reliance on test scores as a screening mechanism for college or university admissions or for job placement or promotion. Methods. We introduce a simple hurdles/threshold model to study one particular mechanism that has been recently proposed to generate a ‘‘compromise’’ between race-normed or gender-normed standards for accep...

A model of the mechanism of residue pitch perception is revisited. It is evaluated in the context of some new empirical results, and it is proposed that the model is able to reconcile a number of differing approaches in the history of theories of pitch perception. The model consists of four sequential processing stages: peripheral frequency selectivity, within-channel half-wave rectification an...

The automaticity of gaze-induced joint attention is well known in relatively easy cognitive tasks; but its role in harder tasks had never been examined. This encouraged us to study automaticity in hard tasks, tasks presenting the subjects with high perceptual loads. The Rapid Serial Visual Presentation (RSVP) paradigm was used to present participants with two streams of bilaterally displayed di...

This report covers work of the Optics Division at Lincoln Laboratory for the period 1 January through 30 June 1974. The topics covered are laser technology and propagation and optical measuremerts and inst r urn ent ati on. Additional information on the optics program may be found in the semiannual technical summary reports to the Advanced Research Projects Agency.

In an earlier paper, we designed a similarity based video retrieval system. Queries are speciied in a language called Hierarchical Temporal Language (HTL). In this paper, we present several extensions of the HTL language. These extensions include queries that can have the negation operator and any other logical and temporal operators such as disjunction. EEcient algorithms for processing querie...

A metering scheme is a method by which an audit agency is able to measure the interaction between clients and servers on the web during a certain number of time frames. Naor and Pinkas 7] considered metering schemes in which any server is able to construct a proof to be sent to the audit agency if and only if it has been visited by at least a number, say h, of clients in a given time frame. In ...