WOBIB: 14 - Hugdahl, et al. (2000) Effects of attention ...
 
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K. Hugdahl; Ian Law; S. Kyllingsbaek; K. Bronnick; Anders Gade; Olaf B. Paulson. Effects of attention on dichotic listening: an 15O-PET study. Human Brain Mapping 10(2):87-97, 2000. PMID: 10864233. WOBIB: 14.

The present study investigated the effect of attention on brain activation in a dichotic listening situation. Dichotic listening is a technique to study laterality effects in the auditory sensory modality. Two different stimuli were presented simultaneously, one in each ear. Twelve subjects listened to lists of consonant-vowel syllables, or short musical instrument passages, with the task of detecting a "target" syllable or musical instrument by pressing a button. The target stimulus appeared an equal number of times in the left and right ear. The subjects were instructed to either concentrate on the stimuli presented in both ears, or only on the left or right ear stimulus. Brain activation was measured with 15O-PET, and significant changes in regional normalized counts (rNC) were evaluated using statistical parametric mapping (SPM96) software. Concentrating on either the right or left ear stimulus significantly decreased activity bilaterally in the temporal lobes compared to concentrating on both ear stimuli, at the expense of an increased activation in the right posterior and inferior superior parietal lobe. The CV-syllables activated areas corresponding to the classic language areas of Broca and Wernicke. The musical instrument stimuli mainly activated areas in visual association cortex, cerebellum, and the hippocampus. An interpretation of the findings is that attention has a facilitating effect for auditory processing, causing reduced activation in the primary auditory cortex when attention is explicitly recruited. The observed activations in the parietal lobe during the focused attention conditions could be part of a modality non-specific "attentional network".

Asymmetry: 0.63841 (left: -1, right: +1)

VRML2 file (123 Kb)

1 Divided attention versus focused attention. Either attend to both ears or attend to left or right ear and press a button when the target stimulus appeared. WOEXP: 36.
2 Focused attention versus divided attention. Either attend to both ears or attend to left or right ear and press a button when the target stimulus appeared. WOEXP: 37.
3 Attention to consonant-vowels in the left ear versus divided attention. Either attend to both ears or attend to left ear and press a button when the target stimulus appeared. WOEXP: 38.
4 Attention to consonant-vowels in the right ear versus divided attention. Either attend to both ears or attend to right ear and press a button when the target stimulus appeared. WOEXP: 39.
5 Attention to musical instrument in the left ear versus divided attention. Either attend to both ears or attend to left ear and press a button when the target stimulus appeared. WOEXP: 40.
6 Attention to consonant-vowels versus attention to musical instruments. Attend to sound and press a button when the target stimulus appeared. WOEXP: 41.
7 Attention to musical instruments versus attention to consonant-vowels. Attend to sound and press a button when the target stimulus appeared. WOEXP: 42.
8 Focused attention to left ear versus focused attention to right ear. Attend to sound and press a button when the target stimulus appeared. WOEXP: 43.


corner cube of WOBIB_14

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