[Influences of two different training paradigms on spatial learning and memory performance of hippocampal injured rats].

In this study, the 5 d and 7 d training paradigms were adopted to investigate the influences of different training procedures on the performance of spatial learning and memory of the hippocampal injured rats. The results showed that during the hidden-platform acquisition training, similar spatial learning dysfunctions were indicated in those two training paradigms. Whereas, when the spatial memories have been evaluated, compared with the 5 d training groups, the rats under 7 d training procedure not only crossed the platform location less, but also preferred to spend less time in the target quadrant.

[Effects of morphine on pupillary light reflex in monkeys].

The pupil size of both human and other animals can be affected by light. Many kinds of psychiatrical and psychological disorders, such as drug abuse, associate with abnormal properties of pupillary light reflex. Thus, the properties of pupillary light reflex could serve as an indicator for drug abuse detection.

Effects of prenatal exposure to a 50-Hz magnetic field on one-trial passive avoidance learning in 1-day-old chicks.

We investigated memory impairment in newly hatched chicks following in ovo exposure to a 50-Hz magnetic field (MF) of 2 mT (60 min/day) on embryonic days 12-18. Isolated and paired chicks were used to test the effect of stress during training, and memory retention was tested at 10, 30, and 120 min, following exposure to a bitter-tasting bead (100% methylanthranilate). Results showed that memory was intact at 10 min in both isolated and paired chicks with or without MF exposure.

Influence of physical parameters of sound on the sensory gating effects of N40 in rats.

Sensory gating is the ability of the brain to modulate its sensitivity to incoming stimuli. The N40 component of the auditory evoked potential, evaluated with the paired click paradigm, was used to probe the gating effect in rats. The physical characteristics of the first and second sounds (S1 and S2), such as frequency, duration, and intensity, were altered in three experiments in this study.

Telemetric recordings of single neuron activity and visual scenes in monkeys walking in an open field.

This paper describes a portable recording system and methods for obtaining chronic recordings of single units and tracking rhesus monkey behavior in an open field. The integrated system consists of four major components: (1) microelectrode assembly; (2) head-stage; (3) recording station; and (4) data storage station, the first three of which are carried by the monkey and weigh 800 g. Our system provides synchronized video and electrophysiological signals, which are transmitted by a wireless system to a distance of 50 m.