Speed and direction response profiles of neurons in macaque MT and MST show modest constraint line tuning

被引:10
作者
Duijnhouwer, Jacob [1 ]
Noest, Andre J. [2 ]
Lankheet, Martin J. M. [3 ]
van den berg, Albert V. [4 ]
van Wezel, Richard J. A. [2 ,5 ]
机构
[1] Rutgers State Univ, Ctr Mol & Behav Neurosci, Newark, NJ 07102 USA
[2] Radboud Univ Nijmegen, Donders Inst Brain Cognit & Behav, Dept Biophys, NL-6525 EZ Nijmegen, Netherlands
[3] Wageningen Univ, Dept Anim Sci, Expt Zool Grp, NL-6700 AP Wageningen, Netherlands
[4] RUNMC, Donders Inst Brain Cognit & Behav, Dept Cognit Neurosci, Nijmegen, Netherlands
[5] Univ Twente, Dept Biomed Signals & Syst, MIRA, Inst Biomed Technol & Tech Med, NL-7500 AE Enschede, Netherlands
关键词
optic flow; visual motion; motion speed; motion direction; extrastriate cortex; area MT; area MST; RECEPTIVE-FIELD PROPERTIES; TEMPORAL VISUAL AREA; OPTIC FLOW STIMULI; SELF-MOTION; HEADING PERCEPTION; EYE-MOVEMENTS; SELECTIVITY; VELOCITY; CORTEX; CELLS;
D O I
10.3389/fnbeh.2013.00022
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
010107 [宗教学]; 030301 [社会学]; 070906 [古生物学及地层学(含古人类学)];
摘要
Several models of heading detection during smooth pursuit rely on the assumption of local constraint line tuning to exist in large scale motion detection templates. A motion detector that exhibits pure constraint line tuning responds maximally to any 2D-velocity in the set of vectors that can be decomposed into the central, or classic, preferred velocity (the shortest vector that still yields the maximum response) and any vector orthogonal to that. To test this assumption, we measured the firing rates of isolated middle temporal (MT) and medial superior temporal (MST) neurons to random dot stimuli moving in a range of directions and speeds. We found that as a function of 2D velocity, the pooled responses were best fit with a 2D Gaussian profile with a factor of elongation, orthogonal to the central preferred velocity, of roughly 1.5 for MST and 1.7 for MT. This means that MT and MST cells are more sharply tuned for speed than they are for direction; and that they indeed show some level of constraint line tuning. However, we argue that the observed elongation is insufficient to achieve behavioral heading discrimination accuracy on the order of 1-2 degrees as reported before.
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页数:11
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