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Article: Response of medial medullary reticular neurons to otolith stimulation during bidirectional off-vertical axis rotation of the cat

TitleResponse of medial medullary reticular neurons to otolith stimulation during bidirectional off-vertical axis rotation of the cat
Authors
Keywordsbidirectional response sensitivity
cat
medial medullary reticular neuron
off-vertical axis rotation
otolith
response dynamic
spatial property
Issue Date1996
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/brainres
Citation
Brain Research, 1996, v. 732 n. 1-2, p. 159-168 How to Cite?
AbstractIn decerebrate cats, the extracellular activities of neurons in the medial medullary reticular formation were studied during constant velocity off-vertical axis rotations (OVAR) in the clockwise (CW) and counterclockwise (CCW) directions (at 10° tilt). Spontaneously active neurons demonstrated sinusoidal position-dependent discharge modulations to OVAR which selectively stimulates the otoliths. Two features of neuronal responses to bidirectional OVAR were identified. Within the velocity spectrum tested (1.75-15°/s), some neurons showed symmetric bidirectional response sensitivity (δ value) to CW and CCW rotations. The spread of the δ values of each of these neurons with velocity was small. This group of reticular neurons were described as exhibiting symmetric and velocity-stable bidirectional response sensitivity. The mathematically derived gain tuning ratios of these neurons were within the range of narrowly spatiotemporal-tuned neurons. Another group of reticular neurons, however, showed asymmetric bidirectional response sensitivity to CW and CCW rotations; a few of these neurons were responsive only to OVAR of one direction but not to both. For each of this second group of neurons, the spread of the δ values with velocity was large. These reticular neurons were described as exhibiting asymmetric and velocity-variable bidirectional response sensitivity. The gain tuning ratios of these latter neurons were found to be within the range of broadly spatiotemporal-tuned neurons. Single neurons of both groups displayed orientational tuning. Both the best response orientations of neurons that showed symmetric and velocity-stable bidirectional response sensitivity and the preferred orientations of neurons that showed asymmetric and velocity-variable bidirectional response sensitivity were found to point in all directions on the rotary plane. The response dynamics of the former group of neurons was also examined. All showed flat response gain across the entire velocity range. Some showed a flat response lead while others showed a progressive shift from small response lead at low velocity to phase close to zero at higher velocities. The functional significance of these medial medullary reticular neurons to the direction and orientation of head tilt is discussed.
Persistent Identifierhttp://hdl.handle.net/10722/81106
ISSN
2015 Impact Factor: 2.561
2015 SCImago Journal Rankings: 1.351
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChan, YSen_HK
dc.contributor.authorChen, CWen_HK
dc.contributor.authorLai, CHen_HK
dc.date.accessioned2010-09-06T08:13:54Z-
dc.date.available2010-09-06T08:13:54Z-
dc.date.issued1996en_HK
dc.identifier.citationBrain Research, 1996, v. 732 n. 1-2, p. 159-168en_HK
dc.identifier.issn0006-8993en_HK
dc.identifier.urihttp://hdl.handle.net/10722/81106-
dc.description.abstractIn decerebrate cats, the extracellular activities of neurons in the medial medullary reticular formation were studied during constant velocity off-vertical axis rotations (OVAR) in the clockwise (CW) and counterclockwise (CCW) directions (at 10° tilt). Spontaneously active neurons demonstrated sinusoidal position-dependent discharge modulations to OVAR which selectively stimulates the otoliths. Two features of neuronal responses to bidirectional OVAR were identified. Within the velocity spectrum tested (1.75-15°/s), some neurons showed symmetric bidirectional response sensitivity (δ value) to CW and CCW rotations. The spread of the δ values of each of these neurons with velocity was small. This group of reticular neurons were described as exhibiting symmetric and velocity-stable bidirectional response sensitivity. The mathematically derived gain tuning ratios of these neurons were within the range of narrowly spatiotemporal-tuned neurons. Another group of reticular neurons, however, showed asymmetric bidirectional response sensitivity to CW and CCW rotations; a few of these neurons were responsive only to OVAR of one direction but not to both. For each of this second group of neurons, the spread of the δ values with velocity was large. These reticular neurons were described as exhibiting asymmetric and velocity-variable bidirectional response sensitivity. The gain tuning ratios of these latter neurons were found to be within the range of broadly spatiotemporal-tuned neurons. Single neurons of both groups displayed orientational tuning. Both the best response orientations of neurons that showed symmetric and velocity-stable bidirectional response sensitivity and the preferred orientations of neurons that showed asymmetric and velocity-variable bidirectional response sensitivity were found to point in all directions on the rotary plane. The response dynamics of the former group of neurons was also examined. All showed flat response gain across the entire velocity range. Some showed a flat response lead while others showed a progressive shift from small response lead at low velocity to phase close to zero at higher velocities. The functional significance of these medial medullary reticular neurons to the direction and orientation of head tilt is discussed.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/brainresen_HK
dc.relation.ispartofBrain Researchen_HK
dc.rightsBrain Research. Copyright © Elsevier BV.en_HK
dc.subjectbidirectional response sensitivityen_HK
dc.subjectcaten_HK
dc.subjectmedial medullary reticular neuronen_HK
dc.subjectoff-vertical axis rotationen_HK
dc.subjectotolithen_HK
dc.subjectresponse dynamicen_HK
dc.subjectspatial propertyen_HK
dc.titleResponse of medial medullary reticular neurons to otolith stimulation during bidirectional off-vertical axis rotation of the caten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0006-8993&volume=732&spage=159&epage=168&date=1996&atitle=Response+of+medial+medullary+reticular+neurons+to+otolith+stimulation+during+bidirectional+off-vertical+axis+rotation+of+the+caten_HK
dc.identifier.emailChan, YS: yschan@hkucc.hku.hken_HK
dc.identifier.emailLai, CH: chlaib@hku.hken_HK
dc.identifier.authorityChan, YS=rp00318en_HK
dc.identifier.authorityLai, CH=rp00396en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/0006-8993(96)00516-1en_HK
dc.identifier.pmid8891280-
dc.identifier.scopuseid_2-s2.0-0030565509en_HK
dc.identifier.hkuros25599en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0030565509&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume732en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage159en_HK
dc.identifier.epage168en_HK
dc.identifier.isiWOS:A1996VJ03700018-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridChan, YS=7403676627en_HK
dc.identifier.scopusauthoridChen, CW=7501962741en_HK
dc.identifier.scopusauthoridLai, CH=7403086597en_HK

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