Reading Words and Non-Words: A Joint fmri and Eye-Tracking Study
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1 Reading Words and Non-Words: A Joint fmri and Eye-Tracking Study A N N - M A R I E R A P H A I L S R E B C S, S K I D M O R E C O L L E G E D R. J O H N H E N D E R S O N U N I V E R S I T Y O F S O U T H C A R O L I N A A U G U S T 2,
2 Reading in the Brain Past fmri research has looked at brain activation caused by single word reading Fusiform gyrus (Visual Word Form Area) Superior Temporal Gyrus Middle Temporal Gyrus (Cohen et al., 2002; Richlan et al., 2013)
3 Sentences and Words Most studies use isolated words because it is difficult to study sentences in the fmri Sentences and single words have different patterns of activation (Cutting et al., 2006) Differences between word and sentence processing
4 Presentation Format Rapid Serial Visual Presentation (RSVP) used to present words one at a time Variability in stimulus duration can effect brain activation (Mechelli, Gorno-Tempini, & Price, 2003) Using fixation duration would be more reliable and would give an accurate representation of natural reading
5 Eye Tracking Monitoring and recording eye movements Fixation durations Number of fixations Saccades Fixation duration dependent on word characteristics like word length and word frequency
6 Eye-Tracking + functional Magnetic Resonance Imaging Allow us to study brain activation during fixations and saccades Can use sentences instead of just words Reading task to study fixation durations while reading sentences of words and non-words
7 Hypotheses Eye tracking can be used with fmri to study properties of words in sentences There will be a correlation between fixation durations and brain activity Brain activation will be different for real words and non-readable words Brain activation will be different when presented in paragraph form and in rapid serial visual presentation (RSVP)
8 Methods Task: read words and non-words in sentence form 15 participants 2 functional runs per participant 44 trials each, 88 trials total Eye-tracking
9 Stimuli 2 x 2 design Word vs. non-word Paragraph vs. RSVP
10 Stimuli RSVP + 6 s + 6 s Two 200 ms 100 ms 200 ms 100 ms goldfish 200 ms 200 ms 100 ms 100 ms
11 Percent Percent Eye-Tracking Data Average fixation durations: Words: ms Non-words: ms Words Non-Words
12 Fixation Durations: Words Positive correlation in the occipito-temporal junction, intraparietal sulcus, and prefrontal cortex. Negative correlation in the left fusiform gyrus and occipital lobe. = increased activity = decreased activity
13 Fixation Duration: Non-Words Positive correlation in the occipito-temporal junction Negative correlation in the occipital lobe. = increased activity = decreased activity
14 Fixation Duration: RSVP No correlation between fixation durations and brain activity in either word condition (words or nonwords) = increased activity = decreased activity
15 Paragraph: occipital lobe Paragraph > RSVP RSVP: bilateral occipito-temporal junction Words Non-Words = paragraph = RSVP
16 Paragraph: Words > Non-Words Words: greater activation for inferior frontal gyrus and left middle temporal gyrus Non-Words: left lateral prefontal cortex = words = non-words
17 RSVP: Words > Non-Words Words: left superior temporal lobe Non-Words: medial frontal cortex and cingulate gyrus = words = non-words
18 Discussion Eye-tracking can be used to study brain activity and fixation durations Low and high level processing Fusiform gyrus and occipital lobe Prefrontal cortex and attention areas RSVP condition Activates more attention areas Not indicative of real fixation durations
19 Discussion Words activate areas associated with semantic and syntactic processing Non-words activate attention areas and higher level processing areas
20 Future Research Eye-tracking can be used to analyze brain activation Future research: use factors such as word frequency and word length Allow for deeper understanding of neural correlates of different aspects reading
21 Acknowledgments Dr. John Henderson Dr. Wonil Choi Dr. Steven Luke Dr. Rutvik Desai Visual Cognition Lab Dr. Jennifer Vendemia Dr. Doug Wedell NSF
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