Activation without Selection: Parallel Right Hemisphere Roles in Language and Intentional Movement?

Richards, Lorie; Chiarello, Christine

doi:10.1006/brln.1997.1837

Cited by 23 publications

(16 citation statements)

References 82 publications

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“…As this issue is yet to be resolved, and we believe that words are used primarily as a means of conveying meaning, we will adopt the former view and assume that priming involves access to lexical and semantic memory. This is consistent with the approach adopted by other researchers investigating linguistic processing in the cerebral hemispheres (e.g., Chiarello, 1998;Koivisto, 1997Koivisto, , 1999Richards & Chiarello, 1997). It must be noted, however, that if the alternative view is adopted, the current study could simply be re-framed as an investigation of the relative contribution of each hemisphere to the recognition of low-imagery words (which is also a worthwhile venture given the conflicting findings on this issue).…”

supporting

confidence: 82%

“…If a related stimulus (called the target) is subsequently presented, responses are facilitated relative to conditions where the target is preceded by an unrelated prime. ''Priming'' effects are calculated by comparing responses to the same target as a function of the relationship with the prime (e.g., BLUE-SKY cf TIGER-1 Some researchers argue that the priming procedure is a useful index of access to semantic memory (e.g., Bleasdale, 1987;deGroot, 1983;Richards & Chiarello, 1997) while others view ''priming'' as simply a reflection of access to lexical memory, which subserves word recognition (e.g., Fodor, 1983;Seidenberg, 1985b). As this issue is yet to be resolved, and we believe that words are used primarily as a means of conveying meaning, we will adopt the former view and assume that priming involves access to lexical and semantic memory.…”

mentioning

confidence: 99%

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Right hemisphere contributions to the comprehension of low-imagery words

Collins¹,

Frew²

2001

Laterality

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supporting

confidence: 82%

mentioning

confidence: 99%

Right hemisphere contributions to the comprehension of low-imagery words

Collins¹,

Frew²

2001

Laterality

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“…Consistent with its activation pattern during hand-selection phase, dlPFC seems especially important in the presence of competing action representations (Rowe et al, 2000;Hadland et al, 2001;Schumacher et al, 2003). Furthermore, the engagement of primarily the right dlPFC and the functionally interconnected right IPL (Fincham et al, 2002;Dosenbach et al, 2006) corroborates that the right hemisphere has a prime role in action planning under conditions of spatial uncertainty (Schumacher et al, 2003;Weiss et al, 2006;Goel et al, 2007) and especially if exploratory processes and external cues are involved (Goldberg et al, 1994;Richards and Chiarello, 1997). In contrast, the left dlPFC would principally handle nonspatial selections (Schumacher et al, 2003).…”

Section: Discussionmentioning

confidence: 84%

Selection of Prime Actor in Humans during Bimanual Object Manipulation

Theorin¹,

Johansson²

2010

J. Neurosci.

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In bimanual object manipulation tasks, people flexibly assign one hand as a prime actor while the other assists. Little is known, however, about the neural mechanisms deciding the role assignment. We addressed this issue in a task in which participants moved a cursor to hit targets on a screen by applying precisely coupled symmetrical opposing linear and twist forces on a tool held freely between the hands. In trials presented in an unpredictable order, the action of either the left or the right hand was spatially congruent with the cursor movements, which automatically rendered the left or right hand the dominant actor, respectively. Functional magnetic resonance imaging indicated that the hand-selection process engaged prefrontal cortical areas belonging to an executive control network presumed critical for judgment and decision-making and to a salience network attributed to evaluation of utility of actions. Task initiation, which involved switching between task sets, had a superordinate role with reference to hand selection. Behavioral and brain imaging data indicated that participants initially expressed two competing action representations, matching either mapping rule, before selecting the appropriate one based on the consequences of the initial manual actions. We conclude that implicit processes engaging the prefrontal cortex reconcile selections among action representations that compete for the establishment of a dominant actor in bimanual object manipulation tasks. The representation selected is the one that optimizes performance by relying on the superior capacity of the brain to process spatial congruent, as opposed to noncongruent, mappings between manual actions and desired movement goals.

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“…Right-brain problem solving generates a matrix of alternative solutions, as contrasted with the left brain's single solution of best fit (Brownell, 1988;Tucker and Williamson, 1984). This answer matrix remains active while alternative solutions are explored (Richards and Chiarello, 1997), a method suitable for the open-ended possibilities inherent in a novel situation.…”

Section: The Inability To Assimilate Noveltymentioning

confidence: 99%

Broad-Perspective Perceptual Disorder of the Right Hemisphere

Schutz

2005

Neuropsychol Rev

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Traditional accounts of right-posterior brain injury describe a syndrome of low-level perceptual sequelae producing marked acute dependency and transient safety concerns. The syndrome is also held to spare cognition and to carry a generally favorable long-term prognosis. The present paper reviews publications and anecdotal data that challenge this picture. Recent theoretical expositions and empirical studies stipulate three major cognitive functions of the right posterior association cortex: processing novel input, guiding reactions to emergencies, and anticipating consequences. Appearing benign after acute recovery, the impairment of these processes produces vocational, social and marital dysfunctions that increase as a function of chronicity, ultimately becoming more broadly disabling than focal injuries in other cortical loci. The unique symptom picture and serious implications suggest that the long-term syndrome should be labeled (Broad-Perspective Perceptual Disorder) and incorporated in future clinical taxonomies, underscoring the need for extraordinary long-term assistance and specialized therapeutics. Procedures for assessment and differential diagnosis are outlined.

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Activation without Selection: Parallel Right Hemisphere Roles in Language and Intentional Movement?

Cited by 23 publications

References 82 publications

Right hemisphere contributions to the comprehension of low-imagery words

Right hemisphere contributions to the comprehension of low-imagery words

Selection of Prime Actor in Humans during Bimanual Object Manipulation

Broad-Perspective Perceptual Disorder of the Right Hemisphere

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