Interhemispheric transfer of colour and shape information in the presence and absence of the corpus callosum

Förster, Bettina; Corballis, Michael C.

doi:10.1016/s0028-3932(99)00050-0

Cited by 27 publications

(13 citation statements)

References 48 publications

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“…Second, all stages are concurrently active: Their activation is continuously passed on from stage to stage such that the increase of activation at a given stage is proportional to the difference between its current activation and the activation of the immediately preceding stage. Thus, the cascade model pictures the flow of information as a continuous wave of activation traveling along successive discrete processing stages, a notion that has proven especially influential in the area of cognitive psychophysiology (e.g., Forster & Corballis, 2000;Scheffers & Coles, 2000). Also, it is one of relatively few models assuming partially overlapping processing stages that are sufficiently specified to allow derivation of explicit quantitative predictions (Schweickert & Mounts, 1998;Ulrich, Mattes, & Miller, 1999).…”

Section: Mixture Models and Their Delta Plotsmentioning

confidence: 99%

Response time models of delta plots with negative-going slopes

Schwarz

Miller

2012

Psychon Bull Rev

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Delta plots (DPs) graphically compare reaction time (RT) quantiles obtained under two experimental conditions. In some research areas (e.g., Simon effects), decreasing delta plots (nDPs) have consistently been found, indicating that the experimental effect is largest at low quantiles and decreases for higher quantiles. nDPs are unusual and intriguing: They imply that RT in the faster condition is more variable, a pattern predicted by few standard RT models. We describe and analyze five classes of well-established latency mechanisms that are consistent with nDPs-exhaustive processing models, correlated stage models, mixture models, cascade models, and parallel channels models-and discuss the implications of our analyses for the interpretation of DPs. DPs generally do not imply any specific processing model; therefore, it is more fruitful to start from a specific quantitative model and to compare the DP it predicts with empirical data.Keywords Delta plot . RT models . Simon effect . Activation suppression model Chronometric research in cognitive psychology often seeks to infer something about the number, nature, and temporal organization of basic information-processing components by looking at how reaction time (RT) varies across two or more experimental conditions. Classic examples of this approach using mean RT are Sternberg's (1969) additive factor method in memory scanning and Treisman and Gelade's (1980) analysis of the slope of RT versus set size functions in visual search.Increasingly, researchers have augmented the study of mean RT with studies of RT distributions. First, in some experimental paradigms, it is possible to distinguish among different classes of models on the basis of their specific predictions concerning between-condition effects on RT distributions as well as means, allowing model classes to be tested via distributional comparisons (e.g

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Section: Mixture Models and Their Delta Plotsmentioning

confidence: 99%

Response time models of delta plots with negative-going slopes

Schwarz

Miller

2012

Psychon Bull Rev

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“…Hanajima et al (2001) found that muscle responses to transcranial stimulation over the left-hand motor cortex can be facilitated when transcranial stimulation has been applied 4–5 ms earlier over the right-hand motor cortex, about the same time as the CUD value estimated from behavioral studies in normal subjects. In acallosal and commissurotomized patients the CUD is prolonged (~30–70 ms) because of longer reaction times to lateralized stimuli in the crossed compared to the uncrossed condition owing to the indirect route required for interhemispheric transfer (e.g., Berlucchi et al 1971; Berlucchi et al 1995; Clarke and Zaidel 1989; Forster and Corballis 1998, 2000). …”

Section: The Role Of the CC For The Integration Of Lower-level Functionsmentioning

confidence: 99%

Contribution of Callosal Connections to the Interhemispheric Integration of Visuomotor and Cognitive Processes

2010

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In recent years, cognitive neuroscience has been concerned with the role of the corpus callosum and interhemispheric communication for lower-level processes and higher-order cognitive functions. There is empirical evidence that not only callosal disconnection but also subtle degradation of the corpus callosum can influence the transfer of information and integration between the hemispheres. The reviewed studies on patients with callosal degradation with and without disconnection indicate a dissociation of callosal functions: while anterior callosal regions were associated with interhemispheric inhibition in situations of semantic (Stroop) and visuospatial (hierarchical letters) competition, posterior callosal areas were associated with interhemispheric facilitation from redundant information at visuomotor and cognitive levels. Together, the reviewed research on selective cognitive functions provides evidence that the corpus callosum contributes to the integration of perception and action within a subcortico-cortical network promoting a unified experience of the way we perceive the visual world and prepare our actions.

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“…A possible neural mechanism for facilitation and interference between global and local processing levels involves interhemispheric interactions (Corballis et al, 2004;Forster and Corballis, 2000). Evidence from a split-brain study (Robertson et al, 1993) suggests that the corpus callosum mediates local-global interference.…”

Section: The Role Of the Corpus Callosum In Interference And Facilitamentioning

confidence: 99%

Local–global interference is modulated by age, sex and anterior corpus callosum size

et al. 2007

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To identify attentional and neural mechanisms affecting global and local feature extraction, we devised a global-local hierarchical letter paradigm to test the hypothesis that aging reduces functional cerebral lateralization through corpus callosum (CC) degradation. Participants (37 men and women, 26-79 years) performed a task requiring global, local, or global+local attention and underwent structural MRI for CC measurement. Although reaction time (RT) slowed with age, all participants had faster RTs to local than global targets. This local precedence effect together with greater interference from incongruent local information and greater response conflict from local targets each correlated with older age and smaller callosal genu (anterior) areas. These findings support the hypothesis that the CC mediates lateralized local-global processes by inhibition of task-irrelevant information under selective attention conditions. Further, with advancing age smaller genu size leads to less robust inhibition, thereby reducing cerebral lateralization and permitting interference to influence processing. Sex was an additional modifier of interference, in that callosum-interference relationships were evident in women but not in men. Regardless of age, smaller splenium (posterior) areas correlated with less response facilitation from repetition priming of global targets in men, but with greater response facilitation from repetition priming of local targets in women. Our data indicate the following dissociation: Anterior callosal structure was associated with inhibitory processes (i.e., interference from incongruency and response conflict), which are vulnerable to the effects of age and sex, whereas posterior callosal structure was associated with facilitation processes from repetition priming dependent on sex and independent of age.

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Interhemispheric transfer of colour and shape information in the presence and absence of the corpus callosum

Cited by 27 publications

References 48 publications

Response time models of delta plots with negative-going slopes

Response time models of delta plots with negative-going slopes

Contribution of Callosal Connections to the Interhemispheric Integration of Visuomotor and Cognitive Processes

Local–global interference is modulated by age, sex and anterior corpus callosum size

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