Autoranging amplifier expands computer’s A/D sensitivity by two decades

This device accepts an analog signal from 0 to +14 V, automatically changes gain to condition the analog output to the limits of a ±1 V A/D converter, and transmits the gain mode as two digital bits. A computer with a 10-bit A/D converter and two sense lines uses this device to obtain the dynamic range of a 16-bit A/D converter. The relatively simple principle of the circuit may be of interest to expand the voltage sensitivity range of other analog devices for slowly changing signals.     

Detoxification at Home: A Brief Solution-Oriented Family Systems Approach

The authors propose an outpatient, solution-oriented, family systems approach to detoxification from alcohol and/or drugs. Research indicates that outpatient detoxification is a viable option, one that will likely be utilized even more frequently as health care costs continue to rise. Nontraditional assumptions about the process of detoxification are suggested that challenge traditional notions about detoxification being only a biomedical, pretreatment event. Criteria are provided for determining the appropriateness of clients for outpatient detoxification and offer information about typical withdrawal symptoms and guidelines for the detoxification environment at home. A case example illustrates the application of this approach in a community mental health program. Suggestions for adapting this approach to various settings are also offered.     

The Scope of WebCounseling: A Survey of Services and Compliance With NBCC Standards for the Ethical Practice of WebCounseling

A survey of 136 Web sites offering counseling through computer chat rooms and e‐mail revealed a wide range of credentials of providers, fees for service, and low levels of compliance with the ethical standards for WebCounseling published by the National Board for Certified Counselors (NBCC). Eight months after the first data collection point, more than a third of the WebCounseling sites were no longer in operation. Credentialed professionals provided significantly higher levels of compliance with NBCC standards than did noncredentialed providers. Implications of Web services for professional practice and public confidence in the profession in this medium are discussed.     

Shifting attention among working memory representations: testing cue type, awareness, and strategic control

It is well known that visual working memory (VWM) performance is modulated by attentional cues presented during encoding. Interestingly, retrospective cues presented after encoding, but prior to the test phase also improve performance. This improvement in performance is termed the retro-cue benefit. We investigated whether the retro-cue benefit is sensitive to cue type, whether participants were aware of their improvement in performance due to the retro-cue, and whether the effect was under strategic control. Experiment 1 compared the potential cueing benefits of abrupt onset retro-cues relying on bottom-up attention, number retro-cues relying on top-down attention, and arrow retro-cues, relying on a mixture of both. We found a significant retro-cue effect only for arrow retro-cues. In Experiment 2, we tested participants' awareness of their use of the informative retro-cue and found that they were aware of their improved performance. In Experiment 3, we asked whether participants have strategic control over the retro-cue. The retro-cue was difficult to ignore, suggesting that strategic control is low. The retro-cue effect appears to be within conscious awareness but not under full strategic control.