A comparison of the rostrocaudal extent of the whisker and the neck regions mapped under light anaesthesia, and the neck region observed in rats mapped under deep anaesthesia

<p><b>Copyright information:</b></p><p>Taken from "Overlapping representations of the neck and whiskers in the rat motor cortex revealed by mapping at different anaesthetic depths"</p><p></p><p>The European Journal of Neuroscience 2008;27(1):228-237.</p><p>Published online Jan 2008</p><p>PMCID:PMC2228390.</p><p>© The Authors (2007). Journal Compilation © Federation of European Neuroscience Societies and Blackwell Publishing Ltd</p> Each horizontal line depicts the maximum rostrocaudal extent of the representation in a single rat aligned to the rostralmost point of the rostral forelimb region (zero on the horizontal axis). The lines for each representation are sorted top to bottom according to the location of the rostralmost point for that region. Note that most of the expansion of the neck representation in the rats mapped under deep anaesthesia overlaps the caudal part of the whisker representation

Areas of representation of the whisker, neck and forelimb regions in the motor cortex as a percentage of total area occupied by these representations when the rats were mapped under light and deep anaesthesia

<p><b>Copyright information:</b></p><p>Taken from "Overlapping representations of the neck and whiskers in the rat motor cortex revealed by mapping at different anaesthetic depths"</p><p></p><p>The European Journal of Neuroscience 2008;27(1):228-237.</p><p>Published online Jan 2008</p><p>PMCID:PMC2228390.</p><p>© The Authors (2007). Journal Compilation © Federation of European Neuroscience Societies and Blackwell Publishing Ltd</p> There was no whisker movement under deep anaesthesia (). Both the neck and forelimb areas were larger under deep anaesthesia; however, only the areas of the neck representations were significantly different (* = 0.011; unpaired -test)

Maps of the motor cortex of two rats at (A and C) threshold currents, and (B and D) when movements at higher currents were considered

<p><b>Copyright information:</b></p><p>Taken from "Overlapping representations of the neck and whiskers in the rat motor cortex revealed by mapping at different anaesthetic depths"</p><p></p><p>The European Journal of Neuroscience 2008;27(1):228-237.</p><p>Published online Jan 2008</p><p>PMCID:PMC2228390.</p><p>© The Authors (2007). Journal Compilation © Federation of European Neuroscience Societies and Blackwell Publishing Ltd</p> Note that at suprathreshold currents the neck movement region expanded into the caudal part of the whisker region. In rat 05–22RT an expansion of the rostral forelimb region is also seen. The whisker movements evoked along with the expanded neck or the rostral forelimb regions are not illustrated in B and D. Sup Thrshld, suprathreshold. Other conventions as for

(A) An outline diagram of the dorsolateral view of the cerebral hemisphere of a rat brain showing the location of the motor cortex and its relation to major sensory areas

<p><b>Copyright information:</b></p><p>Taken from "Overlapping representations of the neck and whiskers in the rat motor cortex revealed by mapping at different anaesthetic depths"</p><p></p><p>The European Journal of Neuroscience 2008;27(1):228-237.</p><p>Published online Jan 2008</p><p>PMCID:PMC2228390.</p><p>© The Authors (2007). Journal Compilation © Federation of European Neuroscience Societies and Blackwell Publishing Ltd</p> Body parts in the somatosensory cortex S1 are marked; Aud., primary auditory cortex. (B) A photomontage showing the somatosensory isomorph revealed in sections of the flattened cortex stained for cytochrome oxidase activity, for rat 05–13RT. The location and details of the motor cortical map are described in relation to such somatosensory isomorphs. Arrowheads point to the microlesions used to align it with the motor map shown in (D). (C and D) Organization of the motor cortex in two rats mapped under light anaesthesia. Note the large medial representation of the whiskers and the smaller neck region. The rostral (r) and the caudal (c) forelimb regions are marked. (D) In rat 05–13RT the rostral forelimb was not seen, probably because of low mapping density in the region due to an overlying blood vessel. The grey outlines show portions of the somatosensory isomorph (see A and B). The bottom panel shows the key to the symbols used in C and D. The stars mark the locations of microlesions used to align topographic map to the somatosensory isomorph. R, rostral; M, medial. The scale bar corresponds to the distance on the brain measured during recordings. Scale bar and the orientation arrows shown in D are also valid for

Power spectral densities of ECoG traces from a rat under (A) light and (B) deep anaesthesia

<p><b>Copyright information:</b></p><p>Taken from "Overlapping representations of the neck and whiskers in the rat motor cortex revealed by mapping at different anaesthetic depths"</p><p></p><p>The European Journal of Neuroscience 2008;27(1):228-237.</p><p>Published online Jan 2008</p><p>PMCID:PMC2228390.</p><p>© The Authors (2007). Journal Compilation © Federation of European Neuroscience Societies and Blackwell Publishing Ltd</p> Insets in the graphs show raw ECoG traces along with a part of the trace in an expanded temporal scale. The spectral density was determined in the 0–50 Hz range and the peaks in the 0–20 Hz range are shown. There were no prominent peaks at higher frequencies

Box plots showing threshold currents required to evoke movements at all the responsive points and for movements of each body part under light and deep anaesthesia

<p><b>Copyright information:</b></p><p>Taken from "Overlapping representations of the neck and whiskers in the rat motor cortex revealed by mapping at different anaesthetic depths"</p><p></p><p>The European Journal of Neuroscience 2008;27(1):228-237.</p><p>Published online Jan 2008</p><p>PMCID:PMC2228390.</p><p>© The Authors (2007). Journal Compilation © Federation of European Neuroscience Societies and Blackwell Publishing Ltd</p> There was significant difference between the median threshold currents under light and deep anaesthesia for all the body parts ( = 0.001, except for hindlimb where = 0.041; Mann–Whitney rank-sum test). No whisker movements were evoked under deep anaesthesia (). A key to the box plots is shown on the extreme right. L, mapped under light anaesthesia; D, mapped under deep anaesthesia