Reach/Grasp Times with Lateral Reach Obstructions

Abstract When moving to grasp an object having adjacent obstacles that limit the space available for placing the fingers, the time for the reach/grasp is dependent on the distance of reaching and the space available for finger placement. Here we model the time taken in terms of these variables and develop mathematical models for the reach and grasp phases of the task and the location of obstacles. Data show that the movement to the target may be made under visual control and that, when the obstacles are close to the target object, a visually-controlled movement is made that is modeled by a modified form of Fitts' law. The time for the two components of the reach/grasp appear to be independent and linearly additive.

[1]  Errol R. Hoffmann,et al.  Optimum layout of an array of controls , 1994 .

[2]  E. Brenner,et al.  A new view on grasping. , 1999, Motor control.

[3]  E. R. Hoffman,et al.  Chapter 15 Limiting motions in prehension , 1995 .

[4]  P. Fitts,et al.  INFORMATION CAPACITY OF DISCRETE MOTOR RESPONSES. , 1964, Journal of experimental psychology.

[5]  C. Hesse,et al.  Visual information about object size and object position are retained differently in the visual brain: Evidence from grasping studies , 2016, Neuropsychologia.

[6]  M. Jeannerod.  The timing of natural prehension movements. , 1984, Journal of motor behavior.

[7]  Ravi S. Menon,et al.  Visually guided grasping produces fMRI activation in dorsal but not ventral stream brain areas , 2003, Experimental Brain Research.

[8]  Hl. de Vries.  The information capacity of the human ear and of the cochlear nerve , 2004, Synthese.

[9]  E. Hoffmann,et al.  Geometrical conditions for ballistic and visually controlled movements. , 1988, Ergonomics.

[10]  Errol R. Hoffmann,et al.  Effective target tolerance in an inverted Fitts task , 1995 .

[11]  M. Mon-Williams,et al.  A test between two hypotheses and a possible third way for the control of prehension , 2000, Experimental Brain Research.

[12]  Jody C. Culham,et al.  Neural correlates of object size and object location during grasping actions , 2015, The European journal of neuroscience.

[13]  E. Brenner,et al.  The influence of obstacles on the speed of grasping , 2003, Experimental Brain Research.

[14]  G. Langolf,et al.  Speed of Aiming Movements , 1977 .

[15]  D. Glencross,et al.  Motor control and sensory motor integration : issues and directions , 1995 .

[16]  C. MacKenzie,et al.  The speed-accuracy trade-off in manual prehension: effects of movement amplitude, object size and object width on kinematic characteristics , 2004, Experimental Brain Research.

[17]  J. Adam,et al.  Distractor effects on pointing: the role of spatial layout , 2001, Experimental Brain Research.

[18]  P. Fitts.  The information capacity of the human motor system in controlling the amplitude of movement. , 1954, Journal of experimental psychology.

[19]  Christine L. MacKenzie,et al.  Functional relationships between grasp and transport components in a prehension task , 1990 .

[20]  M. Jeannerod.  Visuomotor channels: Their integration in goal-directed prehension , 1999 .

[21]  E. Hoffmann,et al.  Finger width corrections in Fitts' law: implications for speed-accuracy research. , 1991, Journal of motor behavior.

[22]  Raoul M. Bongers,et al.  Effects of Changing Object Size During Prehension , 2009, Journal of motor behavior.

[23]  Colin G Drury,et al.  Verification of models for ballistic movement time and endpoint variability , 2013, Ergonomics.

[24]  Errol R Hoffmann,et al.  Targeted Paced and Unpaced Movements in the Transverse and Sagittal Planes , 2017, Journal of motor behavior.