Real-Time Visualization of Neuronal Activity during Perception

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Date of download: 9/17/2016 Copyright © 2016 SPIE. All rights reserved. Dissociated spinal neurons express cameleon in culture. (a) Side view of the posterior.
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Real-Time Visualization of Neuronal Activity during Perception Akira Muto, Masamichi Ohkura, Gembu Abe, Junichi Nakai, Koichi Kawakami  Current Biology  Volume 23, Issue 4, Pages 307-311 (February 2013) DOI: 10.1016/j.cub.2012.12.040 Copyright © 2013 Elsevier Ltd Terms and Conditions

Current Biology 2013 23, 307-311DOI: (10.1016/j.cub.2012.12.040) Copyright © 2013 Elsevier Ltd Terms and Conditions

Figure 1 Spontaneous Neuronal Activity in the Optic Tectum in a Zebrafish Larva (A) UAS:GCaMP7a fish were mated to gSA2AzGFF49A fish that expressed Gal4FF in the tectum. A double-transgenic larva at 3 dpf was embedded in agarose and imaged with a confocal microscope. A single raw image of the fluorescence intensity extracted from a time-lapse movie is shown (see Movie S1). (B) The ratiometric image of (A) was created and pseudocolored to reveal the fluorescence change in the cell body and axon neurite of a single neuron. Scale bars represent 20 μm. Current Biology 2013 23, 307-311DOI: (10.1016/j.cub.2012.12.040) Copyright © 2013 Elsevier Ltd Terms and Conditions

Figure 2 Tectal Responses to Visual Stimuli (A) The recording setup, with the directions of the spot stimulus indicated on a display: A, anterior; P, posterior; D, dorsal; V, ventral. d, distance. (B and C) ON and OFF responses in the optic tectum of a 6 days postfertilization (dpf) larva. (B) Ca2+ signals detected in the neuropil (green) and cell body (magenta). Scale bar represents 50 μm. (C) Normalized fluorescence intensity (F/F0) in the neuropil (green) and cell body (magenta) was increased 0.4–0.5 s after ON and OFF of a spot on the display (Movie S2). The black bar indicates duration (3 s) of appearance (ON) of a spot. d = 15 mm. (D and E) Visuotopic responses in the neuropil of a 7 dpf larva. A spot was moved along the display in the A-to-P (D) and V-to-D (E) directions at a speed of 13.4 mm/s for 1.6 s to create six tracks in parallel. The tracks are colored in magenta and green alternately. The area of Ca2+ signals on the neuropil in each frame (10 frames/s) was defined by setting the threshold manually, and the center of mass was plotted and colored in accordance with the color of the track. The Ca2+ signals moved in the A-to-P (D) and V-to-D (E) directions (indicated by arrows), and their movements recapitulated six tracks on the neuropil. Dashed lines indicate the midline of the larva. Scale bar represents 50 μm. d = 20 mm. (F–K) Identification of direction-selective neurons in the optic tectum of a 5 dpf larva. (F and G) A spot was moved along the D-V axis of the display to create six tracks (with a width of 21.45 mm) in the D-to-V (F) or V-to-D (G) directions. (I and J) A spot was moved along the A-P axis of the display to create four tracks (with a width of 14.3 mm) in the P-to-A (I) and A-to-P (J) directions. Cells responding to D-to-V (F) and P-to-A (I) were colored in magenta, and cells responding to V-to-D (G) and A-to-P (J) were colored in green. (H and K) (F) and (I) were merged with (G) and (J), respectively, and direction-selective neurons were identified (arrows). Scale bar represents 25 μm. d = 15 mm. Current Biology 2013 23, 307-311DOI: (10.1016/j.cub.2012.12.040) Copyright © 2013 Elsevier Ltd Terms and Conditions

Figure 3 Tectal Responses during Perception of a Swimming Paramecium (A) In response to a swimming paramecium (arrowheads), Ca2+ transients (arrows) were detected in the neuropil and cell bodies of the left tectum of a 7 dpf larva embedded in agarose (Movie S3). Ratio images were created and pseudocolored. Scale bar represents 100 μm. (B) Retinotopic projections of the retinal ganglion cell axons: D, dorsal; V, ventral; N, nasal; T, temporal; A, anterior; P, posterior. (C–E) Functional visuotopy (Movie S3). White spots indicate the positions of a paramecium, moving in the indicated directions. Green spots indicate the positions of Ca2+ signals in the neuropil. Scale bars represent 100 μm. (C) A paramecium moved from the right to left hemifield, and the Ca2+ signal moved from the left to right tectum. (D) A paramecium and Ca2+ signals moved from ventral to dorsal. (E) A paramecium and Ca2+ signals moved from posterior to anterior. (F and G) Ca2+ signals in the tectum of a 7 dpf larva evoked by motion of a paramecium (Movie S4). (F) Ratio images of Ca2+ signals (arrows) detected when a paramecium (arrowheads) started to move. Scale bar represents 250 μm. (G) Graph plots of Ca2+ signals and positional changes of the paramecium. The paramecium started to move at 0.7 s (upper graph), and the fluorescence change was detectable after 0.9 s (lower graph). Current Biology 2013 23, 307-311DOI: (10.1016/j.cub.2012.12.040) Copyright © 2013 Elsevier Ltd Terms and Conditions

Figure 4 Tectal Responses of a 5 dpf Free-Swimming Larva during Perception of a Prey (A–D) Ca2+ signals in the tectum and prey capture behavior (Movie S5). (A–C) Ca2+ signals (arrows) were detected in the left tectum (arrows) when a paramecium moved from posterior to anterior on the right. Insets are pseudocolored ratio images. (C and D) The fish changed its direction and started approach swimming. The swimming paramecium is colored in magenta and encircled by dotted lines. (E) Left: positions of total Ca2+ signals observed on the tectal neuropil during the recording. Right: histogram of the Ca2+ signals’ relative distances along the anteroposterior axis of the tectum. (F) Left: positions of the Ca2+ signals observed in (C), one frame before the start of approach swimming. Right: histogram of the Ca2+ signals’ relative distances. Scale bar represents 100 μm. Current Biology 2013 23, 307-311DOI: (10.1016/j.cub.2012.12.040) Copyright © 2013 Elsevier Ltd Terms and Conditions