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An Eye Tracking Paradigm for Analyzing the Processing Time o

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Vlad Abramovich

on 31 March 2015

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Transcript of An Eye Tracking Paradigm for Analyzing the Processing Time o

An Eye Tracking Paradigm for Analyzing the Processing Time of Sentences with Different Linguistic Complexities
Why?
Client puts on their headphones
The HIS uploads two pictures (Regions of Interest)
The client hears a preloaded voice talking about the situation which is going on in one of the pictures. (ROI1, ROI2)
The client is expected to look at the picture that corresponds with the story they are hearing and follow certain words with their eyes.
The program measures Reaction times and processing speed.
Length of the test
The test takes about 3 hours to complete.
Conclusion
What is it?
An experimental method of testing a clients
speech comprehension with the additional information provided by visual stimuli.
These results can also be used during the
counseling portion of the HIS role to help
clients through the grieving stages.
Rational Behind
the Idea
A measured increase in cognitive effort
How is it Measured?
The
EyeLink CL high-speed camera
plays a huge role
as it follows the clients eye movements to measure and calculate the recognition accuracy and reaction time. Also the
keyboard
is used to make the final decision on which picture relate to the story.
Test in a Nutshell
OLACS

The
O
ldenburg
L
inguistically and
A
udiologically
C
ontrolled
S
entences - The OLACS corpus is a custom designed set of sentences of varying complexity and matching pictures. The lexical material used for the sentences has been controlled for word frequency and syllable count.
There are two different
sentence
structures that the OLACS sentences take in this test:
1)
Verb-Second Structure
- Subject, Verb, Object (SVO)
Object, Verb, Subject (OVS) And ambiguous Object, Verb, Subject (ambOVS)
2)
Relative-Clause Structure
- Subject relative (SR),
Object relative (OR), and ambSR, ambOR

It is the wet duck that is reprimanded by the loyal dog.


Remember this?
Putting it all Together
The test results are compared to the results of the control group to deduce a challenge in the clients speech understanding.
What futuristic
technology is this?
This new method of testing speech comprehension has proven superior in its results and indeed represent a more accurate speech test results.
Discussion
Why does this method of speech testing appeal to clinicians?
What are the draw backs to this method?
Who are the masterminds?
Study Published - June 20th, 2014
Dorothea Wendt
Thomas Brand
Brigrer Kollimeier
The Participants
There were 17 participants
All were German speaking
All between 18-30 years old
Had uncorrected vision or wore corrective eye wear when it was needed.
= difficulty understanding specific word
A longer than normal processing time
= shows struggle to choose between regions of interest
Response latencies in auditory sentence comprehension: Effects of linguistic versus perceptual challenge.
Test conducted by Tun PA, Benichov J, Wingfield A. In 2010
The group measured the reaction times for sentences with different
sentence structures
presented at a clear audible level.
Their Conclusion?
"Sentence complexity can lead to slower sentence processing. This suggests that sentence processing speed may be a more sensitive measure for detecting difficulties during sentence understanding than standard methods used in audiology, such as speech intelligibility tests."-SRT, WRS
The tests sentences correspond to one of the
7 syntactical structures.
There is approximately 21 sentences per structure.
Resulting in 148 different "syntactically spiked" sentences
Inside Info
But is this new method a viable option for an HIS?
Keeping best practice in mind, is this a possible procedure for a clinic to adopt?
Key to the Test
P
oint of
T
arget
D
isambiguation. (PTD)
PTD represents the moment at which the disambiguating word is presented into the sentence.
It is at this specific point that the person completing the test is expected to look at one of the two pictures, due to the one word that identified which picture is being talked about.
After the sentence, the client is asked to press either "A" key, the "L" key and the "Space" key if they are not sure on their keyboard to finalize their final decision.
The 3 physical results are measured and recorded.
Each test takes about 10 minutes to complete
After each test is done the patient will have 10 minutes break.
FIN
Vlad Abramovich
Andrew Chiang
Full transcript