Ec. Thompson et al., LIP FUNCTION IN SUBJECTS WITH UPPER MOTOR-NEURON TYPE DYSARTHRIA FOLLOWING CEREBROVASCULAR ACCIDENTS, European journal of disorders of communication, 30(4), 1995, pp. 451-466
The lip function of 16 speakers with upper motor neuron damage followi
ng cerebrovascular accident (CVA), was investigated using instrumental
measures. Sixteen, non-neurologically impaired adults matched for age
and sex served as controls. The results of the instrumental investiga
tions revealed that the CVA speakers had patterns of lip function that
were significantly different from the control speakers. Specifically,
on maximum force tasks, the CVA speakers were found to produce signif
icantly lower maximum lip force values. Maximum rate of attempts at li
p movement was also slower in the CVA speakers. In addition, the instr
umental investigation revealed that the CVA speakers demonstrated a si
gnificant decline in pressure over the course of the task involving 10
attempts at maximum lip force. In contrast, the control speakers main
tained a consistent level of force throughout the 10 repetitions/attem
pts. Overall, the findings suggest that the CVA speakers have deficits
in maximum lip force, endurance of lip strength and rate of lip movem
ents. Correlations conducted between instrumental measures of maximum
lip strength and the perceptual ratings of overall intelligibility, pr
ecision of consonants, precision of vowels and length of phonemes reve
aled no significant relationship.