TY - JOUR
T1 - Task-dependent and cell-type-specific Fos enhancement in rat sensory cortices during audio-visual discrimination
AU - Sakata, Shuzo
AU - Kitsukawa, Takashi
AU - Kaneko, Takeshi
AU - Yamamori, Tetsuo
AU - Sakurai, Yoshio
PY - 2002/2/28
Y1 - 2002/2/28
N2 - Attention modulates neural activities in sensory cortices. Because cortical neurons are composed of many types of neurons, the activities of these different types of cells can exhibit different modifications depending on whether an animal pays attention to a particular sensory stimulus or not. In the present study, we examined which types of cortical neurons change their activities in rats during one of two types of audio-visual discrimination (AVD) tasks by using Fos immunohistochemistry. In the tasks, both auditory and visual stimuli were simultaneously presented but only one of the two modalities was task-relevant. Once the rats had learned one of the AVD tasks, presenting only relevant sensory stimuli was sufficient for them to perform the task correctly. These results suggest that the rats indeed attended to the relevant stimuli during the performance of the tasks. We found that Fos expression in the primary auditory and visual cortices was enhanced in a task-dependent manner during the performance of the AVD tasks. The enhancement of Fos expression depended on the behavioural significance of the stimulus in the tasks. Moreover, using double immunohistochemistry of Fos and a cell type-specific marker protein (phosphate-activated glutaminase, nonphosphorylated neurofilament protein, parvalbumin, calretinin or somatostatin), the task-dependent Fos expression was observed preferentially in excitatory neurons but not in inhibitory interneurons. These results suggest that modulation in cortical excitatory neurons might have critical roles in selecting and processing behaviourally relevant sensory stimuli.
AB - Attention modulates neural activities in sensory cortices. Because cortical neurons are composed of many types of neurons, the activities of these different types of cells can exhibit different modifications depending on whether an animal pays attention to a particular sensory stimulus or not. In the present study, we examined which types of cortical neurons change their activities in rats during one of two types of audio-visual discrimination (AVD) tasks by using Fos immunohistochemistry. In the tasks, both auditory and visual stimuli were simultaneously presented but only one of the two modalities was task-relevant. Once the rats had learned one of the AVD tasks, presenting only relevant sensory stimuli was sufficient for them to perform the task correctly. These results suggest that the rats indeed attended to the relevant stimuli during the performance of the tasks. We found that Fos expression in the primary auditory and visual cortices was enhanced in a task-dependent manner during the performance of the AVD tasks. The enhancement of Fos expression depended on the behavioural significance of the stimulus in the tasks. Moreover, using double immunohistochemistry of Fos and a cell type-specific marker protein (phosphate-activated glutaminase, nonphosphorylated neurofilament protein, parvalbumin, calretinin or somatostatin), the task-dependent Fos expression was observed preferentially in excitatory neurons but not in inhibitory interneurons. These results suggest that modulation in cortical excitatory neurons might have critical roles in selecting and processing behaviourally relevant sensory stimuli.
KW - auditory cortex
KW - excitatory neuron
KW - interneuron
KW - selective attention
KW - visual cortex
UR - http://www.scopus.com/inward/record.url?scp=0036460131&partnerID=8YFLogxK
U2 - 10.1046/j.1460-9568.2002.01905.x
DO - 10.1046/j.1460-9568.2002.01905.x
M3 - Article
C2 - 11886453
AN - SCOPUS:0036460131
SN - 0953-816X
VL - 15
SP - 735
EP - 743
JO - European Journal of Neuroscience
JF - European Journal of Neuroscience
IS - 4
ER -