Increased facilitatory connectivity from the pre-SMA to the left dorsal premotor cortex during pseudoword repetition
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Increased facilitatory connectivity from the pre-SMA to the left dorsal premotor cortex during pseudoword repetition. / Hartwigsen, Gesa; Saur, Dorothee; Price, Cathy J; Baumgärtner, Annette; Ulmer, Stephan; Siebner, Hartwig R.
In: J COGNITIVE NEUROSCI, Vol. 25, No. 4, 01.04.2013, p. 580-94.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Increased facilitatory connectivity from the pre-SMA to the left dorsal premotor cortex during pseudoword repetition
AU - Hartwigsen, Gesa
AU - Saur, Dorothee
AU - Price, Cathy J
AU - Baumgärtner, Annette
AU - Ulmer, Stephan
AU - Siebner, Hartwig R
PY - 2013/4/1
Y1 - 2013/4/1
N2 - Previous studies have demonstrated that the repetition of pseudowords engages a network of premotor areas for articulatory planning and articulation. However, it remains unclear how these premotor areas interact and drive one another during speech production. We used fMRI with dynamic causal modeling to investigate effective connectivity between premotor areas during overt repetition of words and pseudowords presented in both the auditory and visual modalities. Regions involved in phonological aspects of language production were identified as those where regional increases in the BOLD signal were common to repetition in both modalities. We thus obtained three seed regions: the bilateral pre-SMA, left dorsal premotor cortex (PMd), and left ventral premotor cortex that were used to test 63 different models of effective connectivity in the premotor network for pseudoword relative to word repetition. The optimal model was identified with Bayesian model selection and reflected a network with driving input to pre-SMA and an increase in facilitatory drive from pre-SMA to PMd during repetition of pseudowords. The task-specific increase in effective connectivity from pre-SMA to left PMd suggests that the pre-SMA plays a supervisory role in the generation and subsequent sequencing of motor plans. Diffusion tensor imaging-based fiber tracking in another group of healthy volunteers showed that the functional connection between both regions is underpinned by a direct cortico-cortical anatomical connection.
AB - Previous studies have demonstrated that the repetition of pseudowords engages a network of premotor areas for articulatory planning and articulation. However, it remains unclear how these premotor areas interact and drive one another during speech production. We used fMRI with dynamic causal modeling to investigate effective connectivity between premotor areas during overt repetition of words and pseudowords presented in both the auditory and visual modalities. Regions involved in phonological aspects of language production were identified as those where regional increases in the BOLD signal were common to repetition in both modalities. We thus obtained three seed regions: the bilateral pre-SMA, left dorsal premotor cortex (PMd), and left ventral premotor cortex that were used to test 63 different models of effective connectivity in the premotor network for pseudoword relative to word repetition. The optimal model was identified with Bayesian model selection and reflected a network with driving input to pre-SMA and an increase in facilitatory drive from pre-SMA to PMd during repetition of pseudowords. The task-specific increase in effective connectivity from pre-SMA to left PMd suggests that the pre-SMA plays a supervisory role in the generation and subsequent sequencing of motor plans. Diffusion tensor imaging-based fiber tracking in another group of healthy volunteers showed that the functional connection between both regions is underpinned by a direct cortico-cortical anatomical connection.
KW - Acoustic Stimulation
KW - Adult
KW - Brain Mapping
KW - Female
KW - Functional Laterality
KW - Humans
KW - Image Processing, Computer-Assisted
KW - Magnetic Resonance Imaging
KW - Male
KW - Models, Psychological
KW - Motor Cortex
KW - Neural Pathways
KW - Oxygen
KW - Photic Stimulation
KW - Reaction Time
KW - Vocabulary
KW - Young Adult
U2 - 10.1162/jocn_a_00342
DO - 10.1162/jocn_a_00342
M3 - SCORING: Journal article
C2 - 23249347
VL - 25
SP - 580
EP - 594
JO - J COGNITIVE NEUROSCI
JF - J COGNITIVE NEUROSCI
SN - 0898-929X
IS - 4
ER -