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Measurements from rat POM9 in session W1

Short description of the experiment:

Electrodes implanted into 10 different locations within the rat's somatosensory system (barrel-vibrissa system) record local field potentials evoked by vibrissa stimulation (evoked potential, EP). The aim of the experiment is to find the differences between the two states of the system - well habituated "standby" and "active" mode of careful information processing. The first 65 potentials recorded during the first part of the session represent the habituated situation. During the second part of the session, mild electric shock is delivered in order to activate the animal and set its brain into more attenttive mode.

Experimental session:

  • 120 evoked potentials: the first 65 are control trials, the rest are conditioned by electric shock (an artefact is visible 500ms (5000 points) after the whisker stimulus, i.e. around 9050 point)
  • sampling frequency 10kHz
  • 1 run - 1400ms - 14000 points; trigger of whisker stimulus at 4050 (405ms)
  • 10 electrodes - 4 cortical and 6 in thalamus
  • kostka (a 3d array) consists of 120 evoked potentials, 14000 points each from 10 electrodes

workspace includes also the averages and standard deviations (sd) and standard error of the mean (sem) for every electrode (average over trials before (pre) and after (po) the introduction of shock)

pliki_wej enumerates the electrodes:

  • w1_cx1dol - cortex 1 (anterior) low
  • w1_cx1gor - cortex 1 (anterior) high
  • w1_cx2dol 2 (posterior) low
  • w1_cx2gor 2 (posterior) high
  • w1_vpmdol - vpm low
  • w1_vpmsro medial
  • w1_vpmgor high
  • w1_pomdol - pom low
  • w1_pomsro medial
  • w1_pomgor high

vpm and pom are two nuclei in thalamus that play a role in the processing of sensory information in the barrel-vibrissa system

the signal in cortex is relatively well understood (see our preprints) understanding of the whole system is now the challenge, especially the signal from the pom and vpm seems to be much more complicated and noisy