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26 ms. 9 ms. Low High Predictability. Low High Predictability. Low High Predictability. 4-6. 1-3. 7-9. Launch Distance from Target (# letters). Low High Predictability. Low High Predictability. Low High Predictability. 4-6. 1-3. 7-9.

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26 ms

9 ms


Low High

Predictability

Low High

Predictability

Low High

Predictability

4-6

1-3

7-9

Launch Distance from Target (# letters)


Low High

Predictability

Low High

Predictability

Low High

Predictability

4-6

1-3

7-9

Launch Distance from Target (# letters)


Conclusions

  • Apparent additive effect of Freq & Pred in reading is comprised of opposing interactive effects.

  • Possible explanations:

    • Frequency first

    • Floors and ceilings

  • Launch site important


Conclusions

  • Possible explanations


Low High

Predictability

Low High

Predictability

Low High

Predictability

4-6

1-3

7-9

Launch Distance from Target (# letters)


26 ms

9 ms


Launch Distance

1-3

…grabbed a bottle of water from a…

4-6

7-9

Target-1 fixation

frequencyn.s.n.s.marg.

predictabilityn.s.n.s.**

Target fixation

frequency

predictability

process current word(s)

Identify fixation target meaning

process current word(s)

Identify fixation target meaning

process current word(s)

Identify fixation target form


Low High

Predictability

Low High

Predictability

Low High

Predictability

4-6

1-3

7-9

Launch Distance from Target (# letters)


Low High

Predictability

Low High

Predictability

Low High

Predictability

4-6

1-3

7-9

Launch Distance from Target (# letters)


Low High

Predictability

Low High

Predictability

Low High

Predictability

4-6

1-3

7-9

Launch Distance from Target (# letters)


Effects Before the Target?

…grabbed a bottle of water from a…

location of current,

pre-target fixation

  • “Parafoveal-on-foveal” effects (oh no!):

    • When the ease or difficulty in processing a parafoveal target initially manifests itself on the current, pre-target fixation.


4 ms

(marg.)

6 ms

(p<.01)


Parafoveal Processing InfluencesWord Frequency & Predictability Effectson Eye Movements during Reading

Christopher Sébastien Patrick Sara

Hand Miellet O’Donnell Sereno

Glasgow

Language

Processing

University of Glasgow

(est. 1451)


Glasgow

University

LanguageProcessing

GULP

Parafoveal Processing InfluencesWord Frequency & Predictability Effects on Eye Movementsduring Reading

University of Glasgow

(est. 1451)


Glasgow

University

LanguageProcessing

GULP

Parafoveal Processing InfluencesWord Frequency & Predictability Effectson Eye Movements during Reading

Christopher Sébastien Patrick Sara

Hand Miellet O’Donnell Sereno

University of Glasgow

(est. 1451)


Parafoveal Processing InfluencesWord Frequency & Predictability Effectson Eye Movements during Reading

Christopher Sébastien Patrick Sara

Hand Miellet O’Donnell Sereno

Glasgow

Language

Processing

University of Glasgow

(est. 1451)


WOW!

Method

  • Participants: 64

    • native English speaking; normal vision; not dyslexic

    • mean age = 22.2 (range: 18-41); #F=47, #M=17

  • Apparatus: Dual-Purkinje Eyetracker (Gen 5.5)

  • Materials & Design:

    Conditions: Frequency (HF,LF) x Predictability (HP,LP)

    Targets: HF & LF targets matched pair-wise on word length (mean=5.84 letters; range: 5-8 letters)


Materials & Design

  • Participants: 64

  • Apparatus: Dual-Purkinje Eyetracker (Gen 5.5.)

  • Materials & Design:

    Conditions: Frequency (HF,LF) x Predictability (HP,LP)

    Targets: HF & LF targets matched pairwise on word length (5-8 letters; avg = xx)

=== HF === === LF ===

HPLPHPLP

Frequency (BNC, per million) 145 145 4 4

Predictability (1-7) 6.19 4.07 6.11 3.69

Cloze probability 0.57 0.02 0.50 0.01


Freq X Pred: Eye Movements

Altarriba, Kroll, Sholl, & Rayner (1996)

Lavinge, Vitu, & d’Ydewalle (2000)

Rayner, Binder, Ashby, & Pollatsek (2001)

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Rayner, Ashby, Pollatsek, & Reichle (2004)

Miellet, Sparrow, & Sereno (in press)

Inhoff (1984)

conducted

en français


Freq X Pred: Eye Movements

Altarriba, Kroll, Sholl, & Rayner (1996)

Lavinge, Vitu, & d’Ydewalle (2000)

Rayner, Binder, Ashby, & Pollatsek (2001)

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Rayner, Ashby, Pollatsek, & Reichle (2004)

Miellet, Sparrow, & Sereno (in press)

Inhoff (1984)

conducted

in French


High Low

Predictable

High Low

Predictable

High Low

Predictable

4-6

1-3

7-9

Launch Distance from Target (# letters)


Rayner et al. (2004)

LimitationsRemedies

Items per condition:

8

Length of context (# pre-target words):

7.7 words

Target embedded in:

single sentence

22

15.5

2nd of 2

sentences


Freq X Pred: Eye Movements

Altarriba, Kroll, Sholl, & Rayner (1996)

Lavinge, Vitu, & d’Ydewalle (2000)

Rayner, Binder, Ashby, & Pollatsek (2001)

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Rayner, Ashby, Pollatsek, & Reichle (2004)

Miellet, Sparrow, & Sereno (in press)

Inhoff (1984)


WOW!

HF LF

HPLPHPLP

Frequency (BNC, per million) 145 145 4 4

Predictability (1-7) 6.19 4.07 6.11 3.69

Cloze probability 0.57 0.02 0.50 0.01

Method

  • Participants: 64 (mean age = 22; #F=47)

  • Apparatus: Dual-Purkinje Eyetracker (Gen 5.5)

  • Materials & Design:

    Frequency (HF,LF) x Predictability (HP,LP)

    HF & LF targets matched pair-wise on word length (mean = 5.84 letters; range: 5-8 letters)


Method

  • Materials & Design:

    Frequency (HF,LF) x Predictability (HP,LP)

    HF & LF targets matched pair-wise on word length (mean = 5.84 letters; range: 5-8 letters)

HF LF

HPLPHPLP

Frequency (BNC, per million) 145 145 4 4

Predictability (1-7) 6.19 4.07 6.11 3.69

Cloze probability .57 .02 .50 .01

# of items 22 22 22 22


HF LF

HPLPHPLP

Frequency (BNC, per million) 145 145 4 4

Predictability (1-7) 6.19 4.07 6.11 3.69

Cloze probability .57 .02 .50 .01

# of items 22 22 22 22

Method

  • Materials & Design:

    Frequency (HF,LF) x Predictability (HP,LP)

    HF & LF targets matched pair-wise on word length (mean = 5.84 letters; range: 5-8 letters)


Results: Fixation Time Measures

  • Early

    • First fixation duration (FFD)

    • Single fixation duration (SFD)

    • Gaze duration (GD)

    • Probability of skipping (skip) = [1 – prob(fixation)]

  • Later

    • Next forward-going fixation (next)

    • Total Fixation Time (TT)

    • # regressions into target, # regressions out of target

1 fix2+ fixskipreject

63% 12%21% 4%


Parafoveal Pre-processing

In reading, words are processed parafoveally

Before they are foveated.

Reading involves foveal processing and

Parafoveal processing before the


time

T

I

M

E


McConkie’s N ?

  • In fact, the EM condition most resembling RT presentation (i.e., no parafoveal preview), only shows a frequency effect in early measures.

  • However, different patterns emerge when fixation time is


Low High

Predictability

Low High

Predictability

Low High

Predictability

4-6

1-3

7-9

Launch Distance from Target (# letters)


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