HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (7) Citing Articles via Google Scholar Google Scholar Articles by Godey, B. Articles by Cheung, S. W. Search for Related Content PubMed PubMed Citation Articles by Godey, B. Articles by Cheung, S. W.

Functional Organization of Squirrel Monkey Primary Auditory Cortex: Responses to Frequency-Modulation Sweeps

¹Laboratoire IDM, UPRES-EA 3192, Université de Rennes 1, Rennes, France; ²Coleman Memorial Laboratory and W. M. Keck Center for Integrative Neuroscience, Department of Otolaryngology–Head and Neck Surgery, University of California, San Francisco; and ³Bioengineering Graduate Group, University of California, San Francisco and University of California, Berkeley

Submitted 13 September 2004; accepted in final form 4 April 2005

The squirrel monkey twitter call is an exemplar of a broad class of species-specific vocalizations that contain naturally voiced frequency-modulated (FM) sweeps. To investigate how this prominent communication call element is represented in primary auditory cortex (AI), neuronal receptive field properties to pure-tone and synthetic, logarithmically spaced FM-sweep stimuli in 3 barbiturate-anesthetized squirrel monkeys are studied. 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–caudal 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.

This article has been cited by other articles:

				T. A. Brown and R. V. Harrison Responses of Neurons in Chinchilla Auditory Cortex to Frequency-Modulated Tones J Neurophysiol, April 1, 2009; 101(4): 2017 - 2029. [Abstract] [Full Text] [PDF]

				S. D. Washington and J. S. Kanwal DSCF Neurons Within the Primary Auditory Cortex of the Mustached Bat Process Frequency Modulations Present Within Social Calls J Neurophysiol, December 1, 2008; 100(6): 3285 - 3304. [Abstract] [Full Text] [PDF]

				L. Qin, J. Wang, and Y. Sato Heterogeneous Neuronal Responses to Frequency-Modulated Tones in the Primary Auditory Cortex of Awake Cats J Neurophysiol, September 1, 2008; 100(3): 1622 - 1634. [Abstract] [Full Text] [PDF]

				C. A. Atencio, D. T. Blake, F. Strata, S. W. Cheung, M. M. Merzenich, and C. E. Schreiner Frequency-Modulation Encoding in the Primary Auditory Cortex of the Awake Owl Monkey J Neurophysiol, October 1, 2007; 98(4): 2182 - 2195. [Abstract] [Full Text] [PDF]