Mark Timmerman

Learn More
The present study examines whether destruction of the noradrenergic innervation of the forebrain interferes with the processing of sensory information in a manner that results in impaired selective attention. Electro-cortical responses to task-relevant and irrelevant stimuli were found to be sensitive indicators of the rat's attention to the stimuli. The(More)
The purpose of the present study was to test the plaque-removing efficacy of 4 different toothbrushes in relation to duration of toothbrushing. The brushes studied were a manual toothbrush (M), a conventional electric toothbrush--the Blend-a-Dent (BL), the Interplak (IP) and the Braun Plak Control (BPC). For this study, 20 subjects were selected. The study(More)
BACKGROUND Chronic ulnar nerve compression is believed to be the primary cause of sensory and motor impairments of the hand in cyclists, a condition termed Cyclist's Palsy. The purpose of this study was to quantitatively evaluate the effects that hand position and glove type can have on pressure over the ulnar nerve, specifically in the hypothenar region of(More)
This was a 2-part study. The purpose of the 1st part was to examine the relationship between brushing force and plaque removal efficacy comparing a regular manual toothbrush (M) with an electric toothbrush the Braun/Oral-B Plak Control (B). The study consisted of a single oral prophylaxis followed by 5 experiments which differed solely in respect to(More)
Uterine and umbilical uptakes of alanine (Ala) were measured in 10 ewes before (control) and during intravenous infusion of Ala, which increased maternal arterial Ala concentration from 115 +/- 14 to 629 +/- 78 microM (P < 0.001). In 8 of these ewes, placental Ala fluxes were traced by constant intravenous infusion of L-[3,3,3-2H3]Ala in the mother and(More)
OBJECTIVE The purpose of the present study was to test the effectiveness of a finger toothbrush (I-Brush) in removing plaque compared with a flat-trimmed manual toothbrush. MATERIAL AND METHODS For this study, 37 subjects were selected, without previous experience of the use of the I-Brush. Each subject received a finger brush (I-Brush), a manual(More)
Injuries of horses might be related to the force the rider exerts on the horse. To better understand the loading of the horse by a rider, a sensor was developed to measure the force exerted by the rider on the stirrups. In the study, five horses and 23 riders participated. Stirrup forces measured in sitting trot and rising trot were synchronised with rider(More)
REASONS FOR PERFORMING STUDY In the equestrian world it is assumed that riders use changes in weight distribution and leg forces as important instruments to give horses directions about speed and direction of movement. However, the changes of these forces have never been quantified. OBJECTIVES To investigate the distribution of normal forces(More)
  • 1