Integrated circuit measurement of skin conductance

An active skin-conductance measuring device, utilizing integrated circuit operational amplifiers, is described. The transducer offers accurate measurement despite fluctuations in source voltage. The circuit also provides protection in case of accidental short circuit.     

Seeing with sound? exploring different characteristics of a visual-to-auditory sensory substitution device

Sensory substitution devices convert live visual images into auditory signals, for example with a web camera (to record the images), a computer (to perform the conversion) and headphones (to listen to the sounds). In a series of three experiments, the performance of one such device ('The vOICe') was assessed under various conditions on blindfolded sighted participants. The main task that we used involved identifying and locating objects placed on a table by holding a webcam (like a flashlight) or wearing it on the head (like a miner's light). Identifying objects on a table was easier with a hand-held device, but locating the objects was easier with a head-mounted device. Brightness converted into loudness was less effective than the reverse contrast (dark being loud), suggesting that performance under these conditions (natural indoor lighting, novice users) is related more to the properties of the auditory signal (ie the amount of noise in it) than the cross-modal association between loudness and brightness. Individual differences in musical memory (detecting pitch changes in two sequences of notes) was related to the time taken to identify or recognise objects, but individual differences in self-reported vividness of visual imagery did not reliably predict performance across the experiments. In general, the results suggest that the auditory characteristics of the device may be more important for initial learning than visual associations.     

Medical school oath-taking: the moral controversy

Professions typically formulate codes of ethics. Medical students are exposed to various codes and often are expected to recite some code or oath at their graduation. This article reports the findings of a study of one large medical class, asked upon entry to medical school and again at the beginning of their fourth term, which of 13 specified professional, religious, and secular codes of ethics they would turn to for moral guidance in their practice of medicine. The study finds great diversity in the students' choices and no clear pattern of change by their fourth term. Very few students chose the oath they would be asked to recite at their graduation. The article probes the problems this creates for school administrators and professors as well as students. It asks the implications for professional oath-taking at graduation and in the practice of the profession.     

Do dogs (Canis familiaris) seek help in an emergency?

The question of whether dogs recognize an emergency and understand the need to seek help from a bystander was tested in two experiments. In the first experiment, dogs' owners feigned a heart attack in an open field, and in the second experiment, dogs' owners experienced an accident in which a bookcase fell on them and pinned them to the floor. In these experiments, one or two bystanders were available to which dogs could go for help. The dogs' behavior was taped for 6 min after the owner had fallen and was later scored for the frequency and time the dogs spent performing different behaviors. In no case did a dog solicit help from a bystander. It is concluded that dogs did not understand the nature of the emergency or the need to obtain help.