Letter

Nature 451, 61-64 (3 January 2008) | doi:10.1038/nature06445; Received 19 August 2007; Accepted 2 November 2007; Published online 19 December 2007

Sparse optical microstimulation in barrel cortex drives learned behaviour in freely moving mice

Daniel Huber1,2, Leopoldo Petreanu1,2, Nima Ghitani1, Sachin Ranade2, Tomás caron Hromádka2, Zach Mainen2 & Karel Svoboda1,2

  1. Howard Hughes Medical Institute, Janelia Farm Research Campus, Ashburn, Virginia 20147, USA
  2. Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA

Correspondence to: Karel Svoboda1,2 Correspondence and requests for materials should be addressed to K.S. (Email: svobodak@janelia.hhmi.org).

Electrical microstimulation can establish causal links between the activity of groups of neurons and perceptual and cognitive functions1, 2, 3, 4, 5, 6. However, the number and identities of neurons microstimulated, as well as the number of action potentials evoked, are difficult to ascertain7, 8. To address these issues we introduced the light-gated algal channel channelrhodopsin-2 (ChR2)9 specifically into a small fraction of layer 2/3 neurons of the mouse primary somatosensory cortex. ChR2 photostimulation in vivo reliably generated stimulus-locked action potentials10, 11, 12, 13 at frequencies up to 50 Hz. Here we show that naive mice readily learned to detect brief trains of action potentials (five light pulses, 1 ms, 20 Hz). After training, mice could detect a photostimulus firing a single action potential in approximately 300 neurons. Even fewer neurons (approximately 60) were required for longer stimuli (five action potentials, 250 ms). Our results show that perceptual decisions and learning can be driven by extremely brief epochs of cortical activity in a sparse subset of supragranular cortical pyramidal neurons.

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