Download - Faisal ahmed talk w4a2012
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Why Read if You Can Skim: Towards Enabling Faster Screen Reading
Faisal Ahmed, Yevgen Borodin, Yury Puzis, I.V. RamakrishnanStony Brook University, USA. 2012
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Motivation
• Screen Reader – No Support • Ad hoc techniques – Inefficient
Sighted people: Skimming
Sift quicklyBasic meaning
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Contribution
• Identifying the types of skimming
• Proposing a usable interface
• Identifying Use scenarios
• Providing Insight: automated skimming
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Skimming in Accessibility • JAWS – 1st sentence/line of each paragraph– Rules (regular expressions) for skimming
• VoiceOver– Drag a finger & listen
• Ad hoc– HighSpeechRate/NavigationShortcuts/FastKeyPress– Often read entire content
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Summarization
• Existing summarization tools–Provide summaries, Preview Original–No option for• Skim/switch – Summary <=> Original
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Approach• Generated gold-standard summaries– Experiment – 12 sighted, 6 articles
• Developed Screen-reading interface – Switch seamlessly article <=> summary.
• Conducted User Study - 20 blind subjects –– Listening-and-comprehension – Search scenario
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Generating Gold Standard Summaries
Loose Guidelines• Summarize each sentence separately • Include words and phrases from original only• Preserve original word order• Keep it no more than 1/3 of the original article • Make it as informative as possible
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Analysis: Gold Standard Summaries
• Prominent POS• Punctuation preserved
noun
verb
adj
adv
preposition
other
Content Types
Description
C Gold Summaries (Combined 4 versions using voting)B All nouns along with prepositions of C
A All nouns of C D Original Article
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Example: SummariesD: Original paragraph (Comp. Ratio 100%)Twitter, which was created by a 10 person startup in San Francisco was called Obvious. It is a heady mixture of messaging, social networking, ’microblogging’ and something called ’presence.’ It's shorthand for the idea that people should enjoy an ’always on’ virtual omnipresence. Twitter's rapid growth made it the object of intense interest. The object of fair amount of ridicule, as it was derided as high tech trivia or the latest in time-wasting devices. But its use in Iran in the wake of the disputed presidential election of June 2009 brought it new respect. It was used to organize protests and disseminate information in the face of a news media crackdown.C: A Gold-standard summary (Comp. Ratio 25%)Twitter, 10 person startup San Francisco, called Obvious. mixture of social networking microblogging. virtual omnipresence. rapid growth. time-wasting devices. use in Iran disputed election. used to organize protests.
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Example: Summaries
C: A Gold-standard summary (Comp. Ratio 25%)Twitter, 10 person startup San Francisco, called Obvious. mixture of social networking microblogging. virtual omnipresence. rapid growth. time-wasting devices. use in Iran disputed election. used to organize protests.B: Gold Summary with nouns and prep only (Comp. Ratio 17%)Twitter, 10 person startup San Francisco, obvious. mixture of networking microblogging. omnipresence. growth. devices. in Iran election. to protests.
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Example: Summaries
B: Gold Summary with nouns and prep only (Comp. Ratio 17%)Twitter, 10 person startup San Francisco, obvious. mixture of networking microblogging. omnipresence. growth. devices. in Iran election. to protests. A: Gold summary with nouns only (Comp. Ratio 14%)Twitter, 10 person startup San Francisco, obvious. mixture networking microblogging. omnipresence. growth. devices. iran election. protests.
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Scenario: Listening & Comprehension• Within subjects• Sample task to Practice• Set of 10 questions (i.e., General, POS,
Numerals)• Pilot - 1st sentence summary (JAWS) – unuseful
Measure:• # of correct answers
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Scenario: Ad-Hoc Searching
• Within subjects• Sample task to Practice• Questions contain different wording
Find answer using• “Accessible Skimming” VS “ad-hoc techniques”
Measures:• Time (reach/perceive), #Key Presses
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Interface
• Standard Screen Reader• Paragraph/Sentence/Word/Character navigation• Shortcut for toggling Skimming– Switch between summary and original– Preserve current reading position
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Primary Hypotheses
• A:“skimming is significantly faster than regular screen reading”
• B: “user’s comprehension does not fall off with skimming compared to regular screen reading.”
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Results
• Statistical significance (t-test and ANOVA) tests provided strong support of our two primary hypotheses
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After reading each of the summaries A, B, C, and D subjects can answer increasingly
more questions correctly.
A B C D0
102030405060708090
100
0102030405060708090100
Average Correctness Compression Ratio
Skimming using Different types of contents
% A
vera
ge C
orre
ctne
ss
% C
ompr
essi
on R
atio
(13.86) (16.73)
(14.31)(11.64)
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Finding information using gold summaries is faster than in ad hoc searching.
time for TTS time for subject0
20
40
60
80
100
120
140
160
180
Skimming Ad-hoc Techniques
Tim
e(se
cs)
(24.89)
(45.16)(49.54)
(37.3)
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Questionnaires
General Statements Avg (St Dev)I wish I could look through articles faster, than I can with a screen reader
3.80 (1.15)
I often experience difficulties looking for desired information within an article
3.40 (0.99)
Skimming made reading through articles faster 4.20 (1.00)I was able to understand articles equally well when skimming and when reading full article
2.70 (1.34)
I want to use the skimming feature in the future 4.30 (1.03)
5 point Likert Scale Values (St. Dev)[1=strongly disagree, 5=strongly agree]
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Summarization For Skimming
Literature review
examination of visual speed-
reading technique
experiments with the gold-standard
summaries
Main Characteristics:•Nouns, Prepositions, Verbs, Adj/Adv•Extractive Summarization•Extract words and word combinations •Summarize each sentence separately•Preserve original order•Preserve punctuations
Ideal Technique: Semantic and/or Syntactic analysisExtract salient parts
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Testimonials
Good• “If I don't know what I am looking for, this is definitely very
handy. I can decide whether to read further or not.”• “I think skimming would be really helpful for long articles,
books. In the skimming mode, it was like I was going over my class notes!”
Bad• “Skimming is faster, but important info is sometimes
missing.”• “Skimming breaks up information… Introduces
disorganization... There were no reference points… I don't know where I am...”
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Future Research
• Design of an appropriate summarization
• Skim other types of content (i.e., Images, Buttons, lists)
• Variable-speed skimming
This material is based upon work supported by the National Science Foundation - Awards: IIS-0808678 and CNS-0751083
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Questions ?Comments?
Suggestions?
This material is based upon work supported by the National Science Foundation - Awards: IIS-0808678 and CNS-0751083