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Responses to pure tones are assessed by using standard measures of frequency response areas, whereas responses to FM sweeps are classified according to direction selectivity, best speed, and speed tuning preferences. Most neuronal clusters respond to FM sweeps in both directions and over a range of FM speeds. Center frequencies calculated from the average of high and low trigger frequency edges of FM response profiles are highly correlated with pure-tone characteristic frequencies (CFs). However, bandwidth estimates are only weakly correlated with their pure-tone counterparts. CF and direction selectivity are negatively correlated. Best speed maps reveal idiosyncratically positioned spatial aggregation of similar values. In contrast, direction selectivity maps show unambiguous spatial organization. Neuronal clusters selective for upward-directed FM sweeps are located in ventral\u2013caudal AI, where CFs range from 0.5 to 1 kHz. Combinations of pure-tone and FM response parameters form 2 significant factors to account for response variations. These results are interpreted in the context of earlier FM investigations and neuronal encoding of dynamic sounds.<\/jats:p>","DOI":"10.1152\/jn.00950.2004","type":"journal-article","created":{"date-parts":[[2005,8,2]],"date-time":"2005-08-02T21:20:47Z","timestamp":1123017647000},"page":"1299-1311","source":"Crossref","is-referenced-by-count":42,"title":["Functional Organization of Squirrel Monkey Primary Auditory Cortex: Responses to Frequency-Modulation Sweeps"],"prefix":"10.1152","volume":"94","author":[{"given":"Benoit","family":"Godey","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Craig A.","family":"Atencio","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ben H.","family":"Bonham","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christoph E.","family":"Schreiner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven W.","family":"Cheung","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"24","reference":[{"key":"R1","doi-asserted-by":"crossref","unstructured":"Bain LJand Engelhardt M.Introduction to Probability and Mathematical Statistics.Boston, MA: PWS\u2013Kent, 1992.","DOI":"10.2307\/2532587"},{"key":"R2","doi-asserted-by":"publisher","DOI":"10.1126\/science.1080425"},{"key":"R3","doi-asserted-by":"publisher","DOI":"10.1121\/1.1928152"},{"key":"R4","doi-asserted-by":"publisher","DOI":"10.1007\/s002210050501"},{"key":"R5","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.neuro.21.1.149"},{"key":"R6","doi-asserted-by":"publisher","DOI":"10.1152\/jn.2001.85.4.1732"},{"key":"R7","unstructured":"Cleveland WS.Visualizing Data.Summit, NJ: Hobart Press, 1993."},{"key":"R8","doi-asserted-by":"publisher","DOI":"10.1002\/cne.902420404"},{"key":"R9","doi-asserted-by":"publisher","DOI":"10.1016\/0378-5955(86)90110-3"},{"key":"R10","doi-asserted-by":"publisher","DOI":"10.1126\/science.280.5368.1439"},{"key":"R11","unstructured":"Draper NRand Smith H.Applied Regression Analysis.New York: Wiley, 1981."},{"key":"R12","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.22-10-04114.2002"},{"key":"R13","doi-asserted-by":"publisher","DOI":"10.1121\/1.2143403"},{"key":"R14","unstructured":"Gold Band Morgan N.Speech and Audio Signal Processing: Processing and Perception of Speech and Music.New York: Wiley, 2000."},{"key":"R15","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1096-9861(19981019)400:2<271::AID-CNE8>3.0.CO;2-6"},{"key":"R16","doi-asserted-by":"publisher","DOI":"10.1097\/00001756-200105080-00032"},{"key":"R17","doi-asserted-by":"publisher","DOI":"10.1126\/science.6474192"},{"key":"R18","doi-asserted-by":"publisher","DOI":"10.1152\/jn.1986.55.2.256"},{"key":"R19","doi-asserted-by":"publisher","DOI":"10.1152\/jn.1998.79.6.3041"},{"key":"R20","doi-asserted-by":"publisher","DOI":"10.1007\/BF00194107"},{"key":"R21","doi-asserted-by":"publisher","DOI":"10.1016\/0378-5955(92)90080-7"},{"key":"R22","doi-asserted-by":"publisher","DOI":"10.1016\/0378-5955(92)90081-W"},{"key":"R23","doi-asserted-by":"publisher","DOI":"10.1002\/cne.903220409"},{"key":"R24","doi-asserted-by":"publisher","DOI":"10.1093\/biomet\/75.4.800"},{"key":"R25","doi-asserted-by":"publisher","DOI":"10.1007\/BF00641057"},{"key":"R26","doi-asserted-by":"publisher","DOI":"10.1007\/s001140050519"},{"key":"R27","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.97.22.11793"},{"key":"R28","doi-asserted-by":"publisher","DOI":"10.1037\/h0077356"},{"key":"R29","doi-asserted-by":"publisher","DOI":"10.1038\/3729"},{"key":"R30","doi-asserted-by":"publisher","DOI":"10.1152\/jn.2001.86.1.326"},{"key":"R31","doi-asserted-by":"publisher","DOI":"10.1152\/jn.1995.73.4.1513"},{"key":"R32","doi-asserted-by":"publisher","DOI":"10.1121\/1.1910655"},{"key":"R33","doi-asserted-by":"publisher","DOI":"10.1016\/S0003-3472(88)80214-8"},{"key":"R34","doi-asserted-by":"publisher","DOI":"10.1016\/0006-8993(85)91530-6"},{"key":"R35","doi-asserted-by":"publisher","DOI":"10.1016\/S0378-5955(01)00294-5"},{"key":"R36","doi-asserted-by":"publisher","DOI":"10.1007\/s003590050145"},{"key":"R37","doi-asserted-by":"publisher","DOI":"10.1007\/BF00230471"},{"key":"R38","doi-asserted-by":"publisher","DOI":"10.1152\/jn.00632.2001"},{"key":"R39","unstructured":"Nelken I.Feature detection by the auditory cortex. 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