spatial perception presentation

27
Living in Two Spaces Effect of Attention on Perception of Haptic Space Rachel Franz & Siyan Zhao

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Page 1: Spatial perception presentation

Living in Two SpacesEffect of Attention on

Perception of Haptic Space

Rachel Franz & Siyan Zhao

Page 2: Spatial perception presentation

Difference between Haptic Space and Physical SpaceWhat we sense is parallel when we can't see is different from what is physically parallel

Parallel in haptic space

Parallel in physical space

Kappers, A. M. (2007). Haptic space processing–allocentric and egocentric reference frames. Canadian Journal of Experimental Psychology, 61(3), 208-218.

Page 3: Spatial perception presentation

Our Question

How does attention affect what we perceive as parallel by touch alone?

Page 4: Spatial perception presentation

Systematic Deviations

Pattern is always the same

Page 5: Spatial perception presentation

Why do we see this pattern?

First, some definitions:

Egocentric reference frame

Mental representation of space from our own perspective

Page 6: Spatial perception presentation

Why do we see this pattern?

Allocentric reference frame:

Our mental representation of space that is independent of our perspective

...same house, different representations.

Page 7: Spatial perception presentation

Both reference frames contribute to our perception of what is parallel

Why do we see this pattern?

Kappers, A. M. (2004). The contributions of egocentric and allocentric reference frames in haptic spatial tasks. Acta psychologica, 117(3), 333-340.

Page 8: Spatial perception presentation

Why do we see this pattern?

In this task:

Allocentric reference frame-same as physical space, more accurate

Egocentric reference frame-less accurate

Page 9: Spatial perception presentation

Where is the egocentric reference frame located?

For 8 out of 10 participants, the hand centered model was weighted more

Page 10: Spatial perception presentation

The oblique effectInteresting effect occurs at 45 and 135 degrees

90135

Allocentric reference frame

4590

Egocentric

reference

frame

Allocentric reference frame

Page 11: Spatial perception presentation

The oblique effectInteresting effect occurs at 45 and 135 degrees

Participants more accurate for oblique orientations!

4590

Egocentric

reference

frame

Allocentric reference frame

Page 12: Spatial perception presentation

How were reference frames manipulated in other studies?

Zuidhoek et al. (2003)Time delay -> + allocentric

Newport et al. (2002)Vision -> + allocentric

Our study

Attention -> + egocentric

4590

Egocentric

reference

frame

Allocentric reference frame

Page 13: Spatial perception presentation

Based on our question..

How does attention affect what we perceive as parallel by touch alone?

Page 14: Spatial perception presentation

Hypothesis

● Attention causes subjects to place more importance on their egocentric reference frame

Page 15: Spatial perception presentation

Method - IV, DV

● Within-subject design● Independent Variable: Attention● Dependent Variable: Weight of allocentric

and egocentric reference frame

Page 16: Spatial perception presentation

Method - Setup

Target bar (static)Test Bar

Participants sat here

Page 17: Spatial perception presentation

Method - Setup

Target bar (static)Test Bar

Participants sat here

Page 18: Spatial perception presentation

Method - Operationalization

● IV: To focus participants' attention on their hands, we trace the outline of their hands in treatment condition (~20 sec). For control condition, participants sat for 20 seconds

● DV: The degree of deviation of the test bar from the target bar

Target bar Test bar

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Method - Participants

19 Carnegie Mellon University Students:12 were from a Research Method class7 outside of the class

Page 20: Spatial perception presentation

ResultThe treatment group performed significantly better (p = 0.02, t(18) = 2.54)

Page 21: Spatial perception presentation

Large variation supports oblique effect

Some people performed better

Treatment

Control

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Conclusion● Blindfolded participants who had their

hands traced had a better sense when objects were parallel.

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ConclusionParticipants put more weight on their egocentric reference frame after we traced their hands.

4590

Egocentric

reference

frame

Allocentric reference frame

Page 24: Spatial perception presentation

Alternative Explanation

Attention caused increased awareness of hand orientations

Page 25: Spatial perception presentation

Limitations

Who gave more weight to their egocentric reference frame?

Gender?

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Directions for future research

Did the allocentric participants also give more weight to egocentric reference frame?

What happens when people don't attend to spatial properties of their hands?

Page 27: Spatial perception presentation

Contribution

The egocentric reference frame can be manipulated

Attention can affect egocentric reference frame