the cognitive load impacts of assistive technology devices used by sighted teachers in training...
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The Cognitive Load Impacts of Assistive Technology Devices Used by Sighted
Teachers in Training During Literary Braille Instruction
Charles R. Farnsworth Jr., Ed.D.Dominican College
Jamis J. Perrett, Ph.D.Texas A&M University
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Purpose
To compare perceived cognitive load impacts encountered by the manual Perkins braillewriter (MPB) and hybrid technology (HYB) groups in the learning of the literary braille code by sighted teachers in training
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Review of literature
Paas, Renkl, and Sweller (2003) posit the existence of “schemas” (p.2)… constructs of long-term memory which appear
to be permanent in duration
There appears to be an unlimited storage capacity in the long-term memory construct one schema may represent all of the
combined skills of a single activity
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Review of literature
The process of receiving instructions for a learning task creates an extraneous cognitive load on short term memory
When the task is learned to proficiency there has been a transition from extraneous to germane cognitive load
The learner has now engaged existing short-term memory resources to accomplish a task (Kirschner, 2002)
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Research questions
RQ1 To what extent are mental demand and frustration levels impacted in the (MPB) or (HYB) groups during the learning of literary braille?
RQ2 How do temporal (time) demand and effort levels differ in impact in the MPB and HYB groups during the learning of the literary braille?
RQ3 How do physical demand and own performance differ in the MPB and HYB groups?
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Research questions RQ4 How do literary braille code proficiency
levels differ between the MPB and HYB groups according to the NLBCT practice test protocol standard?
RQ5 How do literary braille code proficiency levels differ between the MPB and HYB groups according to the National Certification in Literary Braille (NCLB) test standard?
RQ6 How do attrition/non-completion rates differ between the MPB and HYB groups?
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Research Design
This study employed a quasi-experimental design involving the use of both quantitative and qualitative measures
Quantitative instrumentsNASA TLX, NLBCT Practice Test, NCLB test
Qualitative interviews
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Sample selection
In July 2008, 30 colleges and universities in the U.S. and Canada were invited to participate
Between August 2008 and June 2009, 94 participants were recruited from 18 universities/colleges in the USA and Canada
MPB group: N=43 HYB group: N=51
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Procedure
Four instruments were used to collect data
The NASA – Task Load Index, N = 77 NLBCT – practice test protocol, N = 72 NCLB – National Certification in
Literary Braille test, N = 39 Semi-structured interview schedule (Miller, 2006), N = 10
Perceptions of assistive technology
environments and cognitive load
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NASA –Task Load Index
Participants submitted ratings using the NASA-TLX via the Internet upon completion of each literary braille lesson
http://shinytomato.com/nasa/
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Quantitative data analysis – RQ 1-5
Means of dependent variables were analyzed using a MANOVA design with the following independent variables:Technology groupAgeProgram delivery typePrior education levelPrevious level of braille experienceCollege term
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RQ6 – Attrition Rates The DV complete or did not complete was
analyzed with Chi-square tests of association using the following IV’s:GenderAgeProgram delivery typePrior education levelPrevious level of braille experienceSchoolCollege term Technology group
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ResultsRQ1 - Mental demand and frustration by technology group Technology group was not relevant (p = .628) Prior Braille experience was relevant (p = .006) College term was relevant (p = .002)
RQ2 - Temporal demand and effort in the MPB and HYB groups Technology group was not relevant (p = .361) Prior Braille experience was relevant (p = .001) College term was relevant (p = .028)
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ResultsRQ3 – physical demand and own performance - MPB and HYB groupsTechnology group was not relevant (p =.822)Prior braille experience was relevant (p = .037)
RQ4 – Braillewriting and proofreadingscores by technology groupTechnology group and prior braille experience were not relevant in the model
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ResultsRQ4 – NLBCT practice test protocol 5 errors allowed on each task HYB group: 42 participants, 26% passed MPB group: 30 participants, 47% passed
RQ5 –NCLB descriptive results participants had to pass all 4 sections HYB group: 22 participants, 14% passed MPB group: 17 participants, 47% passed
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RQ5 – NCLB Results by technology group
A MANOVA was used to analyze the MPB and HYB groups
Technology group was not relevant in the model at alpha = .05, Wilks' Lambda = .85, F(4,24) =1.03, p=.413
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NCLB mean scores
MPB group HYB group Perkins 89.00 83.81 Proofreading 90.71 85.27 Passing scores for the Perkins and proofreading sections
are approximately 95 out of a possible 100 points
Multiple choice 46.11 44.77 Slate 44.65 41.81 Passing scores for the multiple choice and slate/stylus
sections are approximately 45 out of a possible 50 points
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ResultsRQ-6 Attrition vs. completion of literary braille courses by technology group
It was found that technology group was not associated with attritionX2(1, N=94)=0.007, p=.934
The attrition rate was 9% for both MPB
and HYB groups
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Qualitative Analysis Glaser and Strauss’ (1967) constant comparison
method was employed to analyze the interviews for emerging themes.
Themes were sorted into categories (Bogdan & Biklen, 1992)
The frequency of each theme was tabulated across all transcripts (Miles & Huberman, 1984)
Themes that occurred with the highest frequencies were taken as the most meaningful results.
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Results: Thematic AnalysisSix themes emerged from the interviews:
1. Physical perceptions of Perky Duck, Perkins and slate and stylus
2. Perceptions of efficiency of the three devices3. Instructional Design Issues4. Mental effort attributed to braille code complexity;
comparison with foreign language learning5. Time pressure for lesson completion due to
extraneous (lifestyle) factors other than technology
Muscle memory typical with using the Perkins does not easily transfer to Perky Duck
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Theme 1: Perceptions of Perky Duck/Perkins Brailler
“There’s no more state competency tests that I have to prove myself to (on the Perkins) for Nemeth code.”
“I think it’s a million times easier…to use Perky Duck than the Perkins.”
“…with Perky Duck your mental effort was changed because you could draft it quickly and go back and proofread it.”
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Theme 2: Perceptions of Efficiency Perkins Brailler/Perky Duck/Slate and Stylus
“…I would like to see something else that is…easier on fingers and is more correctable.”
“I really don’t understand why I have to use the brailler for my exam.…why don’t we have the option to use Perky Duck when everybody else is in the computer age?”
“Well, I’m glad that I have the experience on the Perkins but I will not be doing (future) assignments on that at all. I’m just using the computer.”
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Conclusions/Implications
The lack of significance of technology group was surprising
Possible explanationMPB group participants focused primarily on
one or two devices (Perkins, Slate and stylus)
HYB participants’ had to demonstrate proficiency on three devices (Perkins, Slate and stylus, Perky Duck)
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Conclusions/ImplicationsNASATLX Data: Previous braille experience was significant on RQ’s 1-3 This finding was unexpected Participant background and interview data
suggest that a large proportion of the sample had previous experience Already serving as TVIs in school districtsPrior Awareness of need to demonstrate
proficiency on state competency tests
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Conclusions/Implications NCLB results: Multiple choice section There may be some instructional design
“disconnects” regarding perceptions of most appropriate background knowledge of literary BrailleLower than anticipated scores by both groups on
multiple choice sectionsConcerns raised by instructors who used the
NLBCT practice test as a final exam.
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Conclusions/Implications NCLB results: Slate and stylus Despite the reduced usage of slate and
stylus in programs generally, MPB and HYB mean scores on these sections were relatively highPerhaps some consideration may need
to be given as to the appropriateness of competency demonstration with this device considering recent changes in the field regarding electronic devices.
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