Deck 7: Reaching

Question 1

Changing the size of an object to be grasped typically affects

A) The transport phase as well as the grasp phase
B) The transport phase but not the grasp phase
C) The grasp phase but not the transport phase
D) Neither the transport phase nor the grasp phase

Answer 1

C

Question 2

The best way to help people adapt to inverting lenses is to

A) Use passive manipulation
B) Use active exploration
C) Use the "what" system
D) Cheer them on

Answer 2

B

Question 3

Which of the following equations is referred to as Fitts' Law?

A) MT = a + b log₂2A/W)
B) MT = a + b log₂2W/A)
C) MT = a / b log₂2A/W)
D) MT = b / a log₂2W/A)

Answer 3

A

Question 4

When people turn cranks that cause flags to revolve via gears

A) The people can easily generate complex rotation ratios if the seen rotation ratios are complex
B) The people can easily generate simple rotation ratios if the seen rotation ratios are simple
C) The people can easily generate complex rotation ratios if the seen rotation ratios are simple
D) Both b and c Chapter 7 Answer Key

Question 5

Fitts' Law has been explained at different points in history with

A) The iterative corrections model
B) The impulse variability model
C) The optimized initial impulse model
D) All of the above

Question 6

Hand-space planning predicts __________, whereas joint-space planning predicts ____________.

A) Straight paths in external spatial coordinates, curved paths in intrinsic, joint coordinates
B) Curved paths in external spatial coordinates, straight paths in intrinsic, joint coordinates
C) Curved paths in external spatial coordinates, curved paths in intrinsic, joint coordinates
D) Straight paths in external spatial coordinates, straight paths in intrinsic, joint coordinates

Question 7

Which result is the usual one concerning eye-hand coordination?

A) The eye and hand land on the target simultaneously
B) The hand lands on the target before the eye does
C) The eye lands on the target before the hand does
D) The data are too variable to draw any conclusions

Question 8

During infancy, reaching and grasping typically show sensitivity to

A) Size, then distance, then direction
B) Size, then direction, then distance
C) Distance, then direction, then size
D) Direction, then distance, then size

Question 9

Coupling of the limbs has been ascribed to

A) Coordinative structures
B) Coupling of oscillators
C) Conceptual difficulties
D) All of the above

Question 10

When one hand aims for a target with some index of difficulty ID), its movement time

A) Shortens if the other hand aims for a target with a larger ID
B) Shortens if the other hand aims for a target with a smaller ID
C) Lengthens if the other hand aims for a target with a larger ID
D) Lengthens if the other hand aims for a target with a smaller ID

Question 11

Research on adaptation to distortions of visual feedback indicate that

A) Vision dominates touch
B) Touch dominates vision
C) Touch and vision are equally important
D) Everyone is different

Question 12

Which result is consistent with the two-visual system hypothesis?

A) A circle surrounded by large circles looks smaller than the same center circle surrounded by small circles
B) A disc surrounded by large discs is grasped in the same way as the same center disc surrounded by large discs
C) Damage to one part of the brain impairs object recognition but not vision for action, whereas damage to another part of the brain impairs vision for action but not object recognition
D) All of the above

Question 13

When people move the hand to a target

A) Direction errors tend to be larger than amplitude errors
B) Amplitude errors tend to be larger than directions errors
C) Hand speed tends to scale with amplitude
D) Both b and c

Question 14

In tasks involving finger movements, it has been found, even in patients lacking sensory feedback from their fingers, that

A) Distance reproduction is as good as location reproduction
B) Distance reproduction is better than location reproduction
C) Distance reproduction is worse than location reproduction
D) No reproduction is ever possible

Question 15

A method that has been used to determine how long it takes to use visual feedback to correct manual positioning movements is

A) Have people move back and forth between targets without any visual feedback in any condition
B) Have people move back and forth between targets with full visual feedback in all conditions
C) Have people move back and forth between targets with visual feedback available from one side of the space but not the other
D) Have people move back and forth between targets at different rates both with and without visual feedback

Question 16

If you favored the discrete view over the continuous view of manual positioning, you would argue that

A) Series of movements that appear continuous actually consist of overlapping cascades of discrete movements
B) Series of movements that appear continuous actually consist of disconnected series of discrete movements
C) Series of movements that appear continuous actually consist of disconnected series of continuous movements
D) None of the above

Question 17

Babies appear to take full advantage of visual feedback for reaching by

A) Three months of age
B) Five months of age
C) Seven months of age
D) Nine months of age

Question 18

Which two events tend to coincide during reaching and grasping?

A) Maximal finger widening and start of the slow-approach phase
B) Maximal finger widening and end of the slow-approach phase
C) Minimal finger widening and start of the slow-approach phase
D) Minimal finger widening and end of the slow-approach phase

Question 19

Which of the following would best support the equilibrium point hypothesis?

A) Muscle resting lengths are changed for upcoming voluntary movements
B) Balance is maintained during reaching and grasping movements
C) People can coordinate their efforts
D) None of these outcomes supports the hypothesis

Question 20

The graph relating acceleration to displacement

A) Has larger loops for high IDs than low IDs
B) Has larger loops for low IDs than high IDs
C) Has equal-size loops for low and high IDs
D) Has never been studied