Attentionin sense of touch    DongNyeok Jeong
• What makes somatosensation so different  from other senses to look exclusively into  the impact of attention onto that s...
Somatosensory Cortex•   Areas 1, 2, and 3, which constitute PRIMARY SOMATOSENSORY    AREA I, 40 is SECONDARY SOMATOSENSORY...
SEP• Somatosensory evoked potentials • By combining SEP recordings at    different levels of the somatosensory    pathways...
• latency of 38 and 68ms• attentional modulation of SEFs (125 and  138ms)• one such variable might be the level to  what e...
• SEP consists of the components P50, N70,  P100, N140 and positive late  component(LC).• spatial attention alters the neu...
• Spatial separation of stimulation sites as  well as inter stimulus intervals play an  important role to determine which ...
• When you search for key-ring in a dark  bag, spatial and non-spatial information  gathered from your sense of touch high...
ERP• ERP(Event Related Potential) • measured brain response that is directly    the result of a thought or perception. • m...
SSSEP•   Somatosensory Steady-Stated Evoked Potentials•   A form of response to repetitive sensory    stimulation in which...
The Neuronal Basis of Preferential      Stimulus Processing• A sensory gain control mechanism : visual  modality  • Amplifi...
Topographical distribution
Synchronisation of   neuronal responses• Correlation between pairs of neurons in SII• Temporal synchronisation of action  ...
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EEG presentation

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2012.04.16

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EEG presentation

  1. 1. Attentionin sense of touch DongNyeok Jeong
  2. 2. • What makes somatosensation so different from other senses to look exclusively into the impact of attention onto that sensory system?
  3. 3. Somatosensory Cortex• Areas 1, 2, and 3, which constitute PRIMARY SOMATOSENSORY AREA I, 40 is SECONDARY SOMATOSENSORY AREA II and areas 5 and 7, which constitute the SOMATOSENSORY ASSOCIATION AREA.
  4. 4. SEP• Somatosensory evoked potentials • By combining SEP recordings at different levels of the somatosensory pathways, it is possible to assess the transmission of the afferent volley from the periphery up to the cortex.
  5. 5. • latency of 38 and 68ms• attentional modulation of SEFs (125 and 138ms)• one such variable might be the level to what extend stimuli have to be processed in order to perform a particular task.
  6. 6. • SEP consists of the components P50, N70, P100, N140 and positive late component(LC).• spatial attention alters the neural responses to transient stimuli is not a hard-wired mechanism but might be influenced by a number of variables.
  7. 7. • Spatial separation of stimulation sites as well as inter stimulus intervals play an important role to determine which component of the SEP is modulated with attention.• The somatosensory system in particular seems to be organized in a way to automatically shift attention to that body location where something happens.
  8. 8. • When you search for key-ring in a dark bag, spatial and non-spatial information gathered from your sense of touch highly determines the success of this search.
  9. 9. ERP• ERP(Event Related Potential) • measured brain response that is directly the result of a thought or perception. • measured with EEG, MEG
  10. 10. SSSEP• Somatosensory Steady-Stated Evoked Potentials• A form of response to repetitive sensory stimulation in which the constituent frequency components of the response remain constant with time in both amplitude and phase• 20 (left finger), 26 Hz (right finger)• Amplitude was increased with attention
  11. 11. The Neuronal Basis of Preferential Stimulus Processing• A sensory gain control mechanism : visual modality • Amplification / Suppression • Attended or not stimulus• A change in the temporal pattern of action potentials
  12. 12. Topographical distribution
  13. 13. Synchronisation of neuronal responses• Correlation between pairs of neurons in SII• Temporal synchronisation of action potentials of neurons that code the to-be- attended stimulus produces a ‘pop-out’ from the background noise.

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