Crossing the midline: reducing attentional deficits via interhemispheric interactions

Brooks, Joseph; Wong, Yuting; Robertson, Lynn C.

doi:10.1016/j.neuropsychologia.2004.07.009

Cited by 23 publications

(16 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, some other studies [17,18] suggested that when the consistency or connection between two competing elements is enhanced, the rivalry between them would be weakened, which would then reduce the possibility of excluding the weaker element from awareness, observed as less MIB. This interpretation may provide another way to comprehend the difference in MIB between the two attention conditions in our current study.…”

Section: Discussionmentioning

confidence: 99%

Attentional modulation of motion-induced blindness

Geng

Song

et al. 2007

Chin. Sci. Bull.

View full text Add to dashboard Cite

When a global moving pattern is superimposed on high-contrast stationary or slowly moving stimuli, the stimuli can be perceived as disappearing and reappearing alternately for periods of several seconds. This visual illusory phenomenon was named "motion-induced blindness" (MIB) in recent literature. So far there is no consensus on the mechanism of MIB, especially on the role of attention in this phenomenon. To examine the effect of spatial attention on MIB, the present study manipulated the participants' spatial attention by asking them to respond to two targets simultaneously presented in bilateral visual fields (the divided-attention condition) or only respond to one of them (the fo- cused-attention condition). A central arrow was presented as an endogenous cue to index the target visual field in the focused-attention condition, while a point was presented instead in the divided-attention condition. The results show that the percentage of accumulated invisibility period was larger for the targets in the focused-attention condition than for those in the divided-attention condition. This effect of attention is significant in upper visual field (UVF) and left lower visual field (left LVF); that is, this effect shows a hemispheric asymmetry in LVF but not in UVF. Furthermore, the percentage of accumulated invisibility period was larger for targets in left LVF than for those in right LVF in the focused-attention condition, but no hemispheric asymmetry was found in the divided-attention condition. In addition, the increased percentage of accumulated invisibility period in the focused-attention condition originated merely in the enhancement of the mean phase duration of disappearance in LVF, while the disappearance occurred more frequently and lasted longer for each occurrence, which led to an increase in the total invisibility period, in the focused-than divided-attention condition in UVF. These results suggest that the modulation of spatial attention on MIB has different patterns in UVF and LVF. motion-induced blindness, spatial attention, perceptual rivalry, hemispheric asymmetry, visual field

show abstract

Section: Discussionmentioning

confidence: 99%

Attentional modulation of motion-induced blindness

Geng

Song

et al. 2007

Chin. Sci. Bull.

View full text Add to dashboard Cite

show abstract

“…Because a version had been previously used with neglect patients (Brooks et al, 2005), we used the Feature Search (FS) task in the current experiment. Task order was partially counterbalanced.…”

Section: Adaptive Search Tasksmentioning

confidence: 99%

“…Although traditional paper-and-pencil tests are useful in assessing clinical signs, computerized testing can offer better control of stimulus parameters. By exploiting dynamic control over stimulus presentation time, speed of stimulus motion, or stimulus salience, some investigations have already shown that otherwise-obscured factors can contribute to neglect (e.g., Brooks et al, 2005;Deouell et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Visual hemispatial neglect, re-assessed

List

Brooks

Esterman

et al. 2008

J. Inter. Neuropsych. Soc.

Self Cite

View full text Add to dashboard Cite

Increased computer use in clinical settings offers an opportunity to develop new neuropsychological tests that exploit the control computers have over stimulus dimensions and timing. However, before adopting new tools, empirical validation is necessary. In the current study, our aims were twofold: to describe a computerized adaptive procedure with broad potential for neuropsychological investigations, and to demonstrate its implementation in testing for visual hemispatial neglect. Visual search results from adaptive psychophysical procedures are reported from 12 healthy individuals and 23 individuals with unilateral brain injury. Healthy individuals reveal spatially symmetric performance on adaptive search measures. In patients, psychophysical outcomes (as well as those from standard paper-and-pencil search tasks) reveal visual hemispatial neglect. Consistent with previous empirical studies of hemispatial neglect, lateralized impairments in adaptive conjunction search are greater than in adaptive feature search tasks. Furthermore, those with right hemisphere damage show greater lateralized deficits in conjunction search than do those with left hemisphere damage. We argue that adaptive tests, which automatically adjust to each individual's performance level, are efficient methods for both clinical evaluations and neuropsychological investigations and have the potential to detect subtle deficits even in chronic stages, when flagrant clinical signs have frequently resolved. (JINS, 2008, 14, 243-256.)

show abstract

“…The 2AFC procedure is generally considered to be less affected by bias than the yes-no task and provides relatively simple data for analysis, though it is made less efficient by the requirement for two observation intervals, as opposed to one. Several researchers have used the SIAM YN task in areas such as visual feature search with hemineglect patients (Brooks, Wong, & Robertson, 2005;List et al, 2008), brightness matching (Brown & Rudd, 1998), and auditory filter measurements (Leeuw & Dreschler, 1998). However, 20 years have passed since the description of the SIAM YN task was published (i.e., since Kaernbach, 1990b), and these studies appear to be the only reported use of the SIAM task.…”

mentioning

confidence: 99%

The single interval adjustment matrix (SIAM) yes–no task: an empirical assessment using auditory and gustatory stimuli

Shepherd

Hautus

Stocks

et al. 2011

Atten Percept Psychophys

View full text Add to dashboard Cite

The SIAM yes-no task is an efficient bias-free adaptive procedure for estimating absolute thresholds, though it arguably requires further evaluation prior to its adoption into mainstream psychological research. We report two experiments undertaken in the auditory and gustatory modalities designed to assess the accuracy and efficiency of the SIAM method. In the first experiment, estimates of absolute thresholds for 1000-Hz tones obtained using a two-alternative forced choice adaptive procedure were compared to those obtained using both the SIAM yes-no task and a modification of the SIAM task incorporating the method of free response, the SIAM-rapid. In Experiment 2, we compared absolute thresholds for sucrose in solution obtained with either a two-alternative forced choice adaptive procedure or the SIAM yes-no task. Both experiments demonstrated the efficiency and validity of the SIAM approach, with SIAM thresholds proving to be equivalent to those obtained in the two-alternative forced choice tasks and to those reported in the literature.

show abstract

Crossing the midline: reducing attentional deficits via interhemispheric interactions

Cited by 23 publications

References 30 publications

Attentional modulation of motion-induced blindness

Attentional modulation of motion-induced blindness

Visual hemispatial neglect, re-assessed

The single interval adjustment matrix (SIAM) yes–no task: an empirical assessment using auditory and gustatory stimuli

Contact Info

Product

Resources

About