Speed-accuracy trade-off in the performance of pointing movements in different directions in two-dimensional space

Smyrnis, N; Evdokimidis, I; Constantinidis, TS; Kastrinakis, G

dc.contributor.author	Smyrnis, N	en
dc.contributor.author	Evdokimidis, I	en
dc.contributor.author	Constantinidis, TS	en
dc.contributor.author	Kastrinakis, G	en
dc.date.accessioned	2014-03-01T01:50:21Z
dc.date.available	2014-03-01T01:50:21Z
dc.date.issued	2000	en
dc.identifier.issn	0014-4819	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26024
dc.subject	pointing movement	en
dc.subject	speed-accuracy trade-off	en
dc.subject	movement direction	en
dc.subject	human	en
dc.subject	motor control	en
dc.subject.classification	Neurosciences	en
dc.subject.other	PLANAR REACHING MOVEMENTS	en
dc.subject.other	RAPID HUMAN MOVEMENTS	en
dc.subject.other	FITTS LAW	en
dc.subject.other	KINEMATIC THEORY	en
dc.subject.other	AIMED MOVEMENTS	en
dc.subject.other	MOVING TARGETS	en
dc.subject.other	ARM MOVEMENTS	en
dc.subject.other	TRAJECTORIES	en
dc.subject.other	VARIABILITY	en
dc.subject.other	CEREBELLUM	en
dc.title	Speed-accuracy trade-off in the performance of pointing movements in different directions in two-dimensional space	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	Nine healthy subjects performed 2D pointing movements using a joystick that controlled a screen cursor. Continuous visual feedback was provided until movement completion. Three variables were systematically manipulated: (1) target distance, (2) target size and (3) target direction. A four-way factorial ANOVA was used to analyze the effects of these fixed factors and of the random factor of subject on several movement parameters. Movement time increased with increasing distance and decreasing target size and as predicted from Fitts' law. The target direction did not affect movement time. In contrast the direction, distance and size of the target significantly affected the movement time until the first zero crossing on the speed record reflecting the time to bring the arm into the vicinity of the target. Movements on the lateral axis of the horizontal plane (horizontal movements) resulted in a decrease in initial movement time compared to movements on the anterior axis of the horizontal plane (vertical movements). A significant effect of target distance and direction but not target size was observed for the magnitude of maximum acceleration, maximum speed and maximum deceleration. Horizontal movements had a larger maximum acceleration, speed and deceleration. Furthermore the maximum speed and deceleration occurred earlier in time for these horizontal movements. Finally the number of secondary peaks on the speed record increased with decreasing target size and was not affected by the target distance or target direction. In conclusion our results indicate that different movement parameters are affected by target distance, size and direction. The crucial distinction was between parameters affected by target size and direction. These parameters did not overlap. Target direction affects the first part of movement execution while target size affects the final part of movement execution. Thus a clear segmentation of movement execution in two phases is supported by these results. The implications of these results for theoretical models of speed-accuracy trade-off are discussed.	en
heal.publisher	SPRINGER-VERLAG	en
heal.journalName	EXPERIMENTAL BRAIN RESEARCH	en
dc.identifier.isi	ISI:000089092900003	en
dc.identifier.volume	134	en
dc.identifier.issue	1	en
dc.identifier.spage	21	en
dc.identifier.epage	31	en