Stelios Neophytou

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Previous studies have shown that ultrasound at 20 kHz produces an escape (defence) response in the hooded Lister rat. This study compares the ultrasound-induced behavioural response in the hooded Lister and albino Wistar rat. Ultrasound (continuous tone, square wave, 20 kHz) produced an initial characteristic startle response (brisk running) in the hooded(More)
It has been reported previously that experimenter-presented 20-kHz tones at low intensities produce bursts of locomotor running in Lister hooded rats, but reduced locomotion (freezing) in Wistar rats. Because rats emit 20-kHz tones when stressed, it was proposed that this ultrasound-elicited running and freezing behaviour in Lister hooded and Wistar rats,(More)
1. The brain noradrenergic system may have a role in anxiety disorder. This study has examined the effect of bilateral 6-hydroxydopamine lesions of the noradrenergic neurones in the locus coeruleus (LC) of male Lister hooded rats on behaviour produced by unconditioned and conditioned aversive stimuli. 2. The 6-hydroxydopamine (4 microg) lesions markedly(More)
A method to implicitly derive all tests for each transition fault under established fault-sensitization criteria is presented. The derived quality test functions are enhanced in three different ways to derive better quality test sets. One enhancement restricts fault sensitization along critical subcircuits whose paths have long delays under a fixed-delay(More)
—It has been previously shown that in order to guarantee the temporal correctness of a circuit, only the primitive path delay fault set needs to be tested. However, as in the case of the traditional and simpler path delay fault model, the number of possible faults can be exponential to the circuit size and, therefore, it is only practical to consider the(More)