The effects of an interdisciplinary infant stimulation—parent education intervention program upon infant development

An eight month infant-stimulation/parent-education program was presented to mother-child dyads participating in one of three types of classes: a structured twenty-two session group, an unstructured twenty-two session group, or a structured eleven session group. Infants (2–15 months) in all intervention groups as well as those from a control group were tested three times (pre-test, mid-test, post-test) during the course of the program using the Bayley Mental Test of Infant Development and the Uzgiris-Hunt Ordinal Scales of Psychological Development. Results tend to indicate that the intervention strategy was an effective method of parent education in enhancing infant gains on developmental indices. The results are discussed in relation to a preventative psychotherapeutic model.     

Effects of cocaine on simple reaction times and sensory thresholds in baboons.

The effects of chronic, daily administration of cocaine on auditory and visual reaction times and thresholds were studied in baboons. Single intramuscular injections of cocaine hydrochloride (0.1 to 5.6 mg/kg) were given once daily for periods of 10 to 25 days, and were followed immediately by psychophysical tests designed to assess cocaine's effects on simple reaction times as on auditory and visual threshold functions. Consistent reductions in reaction times were frequently observed over the cocaine dose range of 0.32 to 1.0 mg/kg; at higher doses, either decreases or increases in reaction times were observed, depending upon the animal. Lowered reaction times generally occurred immediately following the 1st day's cocaine injection, and continued through all subsequent days during the dose administration period, suggesting little development of tolerance or sensitivity to these reaction-time effects. Reaction-time decreases showed a U-shaped dose-effect function. The greatest decreases in reaction times occurred from 0.32 to 1.0 mg/kg, and produced an average reaction-time decrease of 10 to 12%. Concurrently measured auditory and visual thresholds showed no systematic changes as a function of cocaine dose. Pausing was observed during performance of the psychophysical tasks, with the length of total session pause times being directly related to cocaine dose.