Azimuthal sensitivity of neurons in primary auditory cortex of cats. II. Organization along frequency-band strips
R. Rajan, L. M. Aitkin and D. R. Irvine Department of Physiology, Monash University, Clayton, Victoria, Australia. 1. The organization of azimuthal sensitivity of units across the dorsoventral extent of primary auditory cortex (AI) was studied in electrode penetrations made along frequency-band stri...
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| creator | Rajan, R Aitkin, L. M Irvine, D. R |
| description | R. Rajan, L. M. Aitkin and D. R. Irvine
Department of Physiology, Monash University, Clayton, Victoria, Australia.
1. The organization of azimuthal sensitivity of units across the
dorsoventral extent of primary auditory cortex (AI) was studied in
electrode penetrations made along frequency-band strips of AI. Azimuthal
sensitivity for each unit was represented by a mean azimuth function (MF)
calculated from all azimuth functions obtained to characteristic frequency
(CF) stimuli at intensities 20 dB or more greater than threshold. MFs were
classified as contrafield, ipsi-field, central-field, omnidirectional, or
multipeaked, according to the criteria established in the companion paper
(Rajan et al. 1990). 2. The spatial distribution of three types of MFs was
not random across frequency-band strips: for contra-field, ipsi-field, and
central-field MFs there was a significant tendency for clustering of
functions of the same type in sequentially encountered units. Occasionally,
repeated clusters of a particular MF type could be found along a
frequency-band strip. In contrast, the spatial distribution of
omnidirectional MFs along frequency-band strips appeared to be random. 3.
Apart from the clustering of MF types, there were also regions along a
frequency-band strip in which there were rapid changes in the type of MF
encountered in units isolated over short distances. Most often such changes
took the form of irregular, rapid juxtapositions of MF types. Less
frequently such changes appeared to show more systematic changes from one
type of MF to another type. In contrast to these changes in azimuthal
sensitivity seen in electrode penetrations oblique to the cortical surface,
much less change in azimuthal sensitivity was seen in the form of azimuthal
sensitivity displayed by successively isolated units in penetrations made
normal to the cortical surface. 4. To determine whether some significant
feature or features of azimuthal sensitivity shifted in a more continuous
and/or systematic manner along frequency-band strips, azimuthal sensitivity
was quantified in terms of the peak-response azimuth (PRA) of the MFs of
successive units and of the azimuthal range over which the peaks occurred
in the individual azimuth functions contributing to each MF (the
peak-response range). In different experiments shifts in these measures of
the peaks in successively isolated units along a frequency-band strip were
found generally to fall into one of four categories: 1) shifts across |
| doi_str_mv | 10.1152/jn.1990.64.3.888 |
| format | Article |
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Department of Physiology, Monash University, Clayton, Victoria, Australia.
1. The organization of azimuthal sensitivity of units across the
dorsoventral extent of primary auditory cortex (AI) was studied in
electrode penetrations made along frequency-band strips of AI. Azimuthal
sensitivity for each unit was represented by a mean azimuth function (MF)
calculated from all azimuth functions obtained to characteristic frequency
(CF) stimuli at intensities 20 dB or more greater than threshold. MFs were
classified as contrafield, ipsi-field, central-field, omnidirectional, or
multipeaked, according to the criteria established in the companion paper
(Rajan et al. 1990). 2. The spatial distribution of three types of MFs was
not random across frequency-band strips: for contra-field, ipsi-field, and
central-field MFs there was a significant tendency for clustering of
functions of the same type in sequentially encountered units. Occasionally,
repeated clusters of a particular MF type could be found along a
frequency-band strip. In contrast, the spatial distribution of
omnidirectional MFs along frequency-band strips appeared to be random. 3.
Apart from the clustering of MF types, there were also regions along a
frequency-band strip in which there were rapid changes in the type of MF
encountered in units isolated over short distances. Most often such changes
took the form of irregular, rapid juxtapositions of MF types. Less
frequently such changes appeared to show more systematic changes from one
type of MF to another type. In contrast to these changes in azimuthal
sensitivity seen in electrode penetrations oblique to the cortical surface,
much less change in azimuthal sensitivity was seen in the form of azimuthal
sensitivity displayed by successively isolated units in penetrations made
normal to the cortical surface. 4. To determine whether some significant
feature or features of azimuthal sensitivity shifted in a more continuous
and/or systematic manner along frequency-band strips, azimuthal sensitivity
was quantified in terms of the peak-response azimuth (PRA) of the MFs of
successive units and of the azimuthal range over which the peaks occurred
in the individual azimuth functions contributing to each MF (the
peak-response range). In different experiments shifts in these measures of
the peaks in successively isolated units along a frequency-band strip were
found generally to fall into one of four categories: 1) shifts across the
entire frontal hemifield; 2) clustering in the contralateral quadrant; 3)
clustering in the ipsilateral quadrant; and 4) clustering about the
midline. In two cases more than one of these four patterns were found along
a frequency-band strip.</description><identifier>ISSN: 0022-3077</identifier><identifier>EISSN: 1522-1598</identifier><identifier>DOI: 10.1152/jn.1990.64.3.888</identifier><identifier>PMID: 2230932</identifier><identifier>CODEN: JONEA4</identifier><language>eng</language><publisher>Bethesda, MD: Am Phys Soc</publisher><subject>Acoustic Stimulation ; Animals ; Auditory Cortex - cytology ; Auditory Cortex - physiology ; Biological and medical sciences ; Cats - physiology ; Ear and associated structures. Auditory pathways and centers. Hearing. Vocal organ. Phonation. Sound production. Echolocation ; Fundamental and applied biological sciences. Psychology ; Neurons - physiology ; Sound Localization - physiology ; Vertebrates: nervous system and sense organs</subject><ispartof>Journal of neurophysiology, 1990-09, Vol.64 (3), p.888-902</ispartof><rights>1991 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c367t-6d58e1f023b985d7912cd17e34363d7e4cdb673b2aca34b42608366eb46643073</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=19430946$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/2230932$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Rajan, R</creatorcontrib><creatorcontrib>Aitkin, L. M</creatorcontrib><creatorcontrib>Irvine, D. R</creatorcontrib><title>Azimuthal sensitivity of neurons in primary auditory cortex of cats. II. Organization along frequency-band strips</title><title>Journal of neurophysiology</title><addtitle>J Neurophysiol</addtitle><description>R. Rajan, L. M. Aitkin and D. R. Irvine
Department of Physiology, Monash University, Clayton, Victoria, Australia.
1. The organization of azimuthal sensitivity of units across the
dorsoventral extent of primary auditory cortex (AI) was studied in
electrode penetrations made along frequency-band strips of AI. Azimuthal
sensitivity for each unit was represented by a mean azimuth function (MF)
calculated from all azimuth functions obtained to characteristic frequency
(CF) stimuli at intensities 20 dB or more greater than threshold. MFs were
classified as contrafield, ipsi-field, central-field, omnidirectional, or
multipeaked, according to the criteria established in the companion paper
(Rajan et al. 1990). 2. The spatial distribution of three types of MFs was
not random across frequency-band strips: for contra-field, ipsi-field, and
central-field MFs there was a significant tendency for clustering of
functions of the same type in sequentially encountered units. Occasionally,
repeated clusters of a particular MF type could be found along a
frequency-band strip. In contrast, the spatial distribution of
omnidirectional MFs along frequency-band strips appeared to be random. 3.
Apart from the clustering of MF types, there were also regions along a
frequency-band strip in which there were rapid changes in the type of MF
encountered in units isolated over short distances. Most often such changes
took the form of irregular, rapid juxtapositions of MF types. Less
frequently such changes appeared to show more systematic changes from one
type of MF to another type. In contrast to these changes in azimuthal
sensitivity seen in electrode penetrations oblique to the cortical surface,
much less change in azimuthal sensitivity was seen in the form of azimuthal
sensitivity displayed by successively isolated units in penetrations made
normal to the cortical surface. 4. To determine whether some significant
feature or features of azimuthal sensitivity shifted in a more continuous
and/or systematic manner along frequency-band strips, azimuthal sensitivity
was quantified in terms of the peak-response azimuth (PRA) of the MFs of
successive units and of the azimuthal range over which the peaks occurred
in the individual azimuth functions contributing to each MF (the
peak-response range). In different experiments shifts in these measures of
the peaks in successively isolated units along a frequency-band strip were
found generally to fall into one of four categories: 1) shifts across the
entire frontal hemifield; 2) clustering in the contralateral quadrant; 3)
clustering in the ipsilateral quadrant; and 4) clustering about the
midline. In two cases more than one of these four patterns were found along
a frequency-band strip.</description><subject>Acoustic Stimulation</subject><subject>Animals</subject><subject>Auditory Cortex - cytology</subject><subject>Auditory Cortex - physiology</subject><subject>Biological and medical sciences</subject><subject>Cats - physiology</subject><subject>Ear and associated structures. Auditory pathways and centers. Hearing. Vocal organ. Phonation. Sound production. Echolocation</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Neurons - physiology</subject><subject>Sound Localization - physiology</subject><subject>Vertebrates: nervous system and sense organs</subject><issn>0022-3077</issn><issn>1522-1598</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1990</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFUT1v2zAQJYoUieN27xKAS7pJ5ZdIagyCtjEQwEs7ExRF2TRk0iGpNsqvL40IydjpDnfv3ru7B8AXjGqMG_Lt4GvctqjmrKa1lPIDWJUyqXDTyguwQqjkFAlxBa5TOiCERIPIJbgkhKKWkhV4untxxynv9QiT9cll98flGYYBejvF4BN0Hp6iO-o4Qz31LoeSmBCzfT6jjM6phptNDbdxp7170dkFD_UY_A4O0T5N1pu56rTvYcrRndIn8HHQY7Kfl7gGv398_3X_UD1uf27u7x4rQ7nIFe8bafGACO1a2fSixcT0WFjKKKe9sMz0HRe0I9poyjpGOJKUc9sxzlk5ma7B11feUwxli5TV0SVjx1F7G6akJEKyoQL9F4gbIWXLaAGiV6CJIaVoB7U8RmGkznaog1dnOxRniqpiRxm5Wbin7mj7t4Hl_6V_u_R1MnocovbGpXfeIotaxt933Lvd_q-LVp32c3JhDLv5rPom-A-n36FX</recordid><startdate>199009</startdate><enddate>199009</enddate><creator>Rajan, R</creator><creator>Aitkin, L. M</creator><creator>Irvine, D. R</creator><general>Am Phys Soc</general><general>American Physiological Society</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TK</scope><scope>7X8</scope></search><sort><creationdate>199009</creationdate><title>Azimuthal sensitivity of neurons in primary auditory cortex of cats. II. Organization along frequency-band strips</title><author>Rajan, R ; Aitkin, L. M ; Irvine, D. R</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c367t-6d58e1f023b985d7912cd17e34363d7e4cdb673b2aca34b42608366eb46643073</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1990</creationdate><topic>Acoustic Stimulation</topic><topic>Animals</topic><topic>Auditory Cortex - cytology</topic><topic>Auditory Cortex - physiology</topic><topic>Biological and medical sciences</topic><topic>Cats - physiology</topic><topic>Ear and associated structures. Auditory pathways and centers. Hearing. Vocal organ. Phonation. Sound production. Echolocation</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Neurons - physiology</topic><topic>Sound Localization - physiology</topic><topic>Vertebrates: nervous system and sense organs</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Rajan, R</creatorcontrib><creatorcontrib>Aitkin, L. M</creatorcontrib><creatorcontrib>Irvine, D. R</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Neurosciences Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of neurophysiology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Rajan, R</au><au>Aitkin, L. M</au><au>Irvine, D. R</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Azimuthal sensitivity of neurons in primary auditory cortex of cats. II. Organization along frequency-band strips</atitle><jtitle>Journal of neurophysiology</jtitle><addtitle>J Neurophysiol</addtitle><date>1990-09</date><risdate>1990</risdate><volume>64</volume><issue>3</issue><spage>888</spage><epage>902</epage><pages>888-902</pages><issn>0022-3077</issn><eissn>1522-1598</eissn><coden>JONEA4</coden><abstract>R. Rajan, L. M. Aitkin and D. R. Irvine
Department of Physiology, Monash University, Clayton, Victoria, Australia.
1. The organization of azimuthal sensitivity of units across the
dorsoventral extent of primary auditory cortex (AI) was studied in
electrode penetrations made along frequency-band strips of AI. Azimuthal
sensitivity for each unit was represented by a mean azimuth function (MF)
calculated from all azimuth functions obtained to characteristic frequency
(CF) stimuli at intensities 20 dB or more greater than threshold. MFs were
classified as contrafield, ipsi-field, central-field, omnidirectional, or
multipeaked, according to the criteria established in the companion paper
(Rajan et al. 1990). 2. The spatial distribution of three types of MFs was
not random across frequency-band strips: for contra-field, ipsi-field, and
central-field MFs there was a significant tendency for clustering of
functions of the same type in sequentially encountered units. Occasionally,
repeated clusters of a particular MF type could be found along a
frequency-band strip. In contrast, the spatial distribution of
omnidirectional MFs along frequency-band strips appeared to be random. 3.
Apart from the clustering of MF types, there were also regions along a
frequency-band strip in which there were rapid changes in the type of MF
encountered in units isolated over short distances. Most often such changes
took the form of irregular, rapid juxtapositions of MF types. Less
frequently such changes appeared to show more systematic changes from one
type of MF to another type. In contrast to these changes in azimuthal
sensitivity seen in electrode penetrations oblique to the cortical surface,
much less change in azimuthal sensitivity was seen in the form of azimuthal
sensitivity displayed by successively isolated units in penetrations made
normal to the cortical surface. 4. To determine whether some significant
feature or features of azimuthal sensitivity shifted in a more continuous
and/or systematic manner along frequency-band strips, azimuthal sensitivity
was quantified in terms of the peak-response azimuth (PRA) of the MFs of
successive units and of the azimuthal range over which the peaks occurred
in the individual azimuth functions contributing to each MF (the
peak-response range). In different experiments shifts in these measures of
the peaks in successively isolated units along a frequency-band strip were
found generally to fall into one of four categories: 1) shifts across the
entire frontal hemifield; 2) clustering in the contralateral quadrant; 3)
clustering in the ipsilateral quadrant; and 4) clustering about the
midline. In two cases more than one of these four patterns were found along
a frequency-band strip.</abstract><cop>Bethesda, MD</cop><pub>Am Phys Soc</pub><pmid>2230932</pmid><doi>10.1152/jn.1990.64.3.888</doi><tpages>15</tpages></addata></record> |
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| ispartof | Journal of neurophysiology, 1990-09, Vol.64 (3), p.888-902 |
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| source | MEDLINE; Alma/SFX Local Collection |
| subjects | Acoustic Stimulation Animals Auditory Cortex - cytology Auditory Cortex - physiology Biological and medical sciences Cats - physiology Ear and associated structures. Auditory pathways and centers. Hearing. Vocal organ. Phonation. Sound production. Echolocation Fundamental and applied biological sciences. Psychology Neurons - physiology Sound Localization - physiology Vertebrates: nervous system and sense organs |
| title | Azimuthal sensitivity of neurons in primary auditory cortex of cats. II. Organization along frequency-band strips |
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