NEURAL RECRUITMENT EXPLAINS WEBERS LAW OF SPATIAL POSITION

被引:22
作者
HESS, RF
HAYES, A
机构
[1] McGill Vision Research, Department of Ophthalmology, McGill University, Montréal
关键词
SPATIAL ALIGNMENT; BISECTION; WEBERS LAW; SPATIAL POSITION; SPATIAL SCALE; CONTRAST RECRUITMENT;
D O I
10.1016/0042-6989(93)90033-S
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
We ask whether the well known Weber's law between spatial localization and element separation for high contrast, spectrally broad-band stimuli is a consequence of the organization of the early visual filters, or a fundamental constraint on the computation of spatial position by more central mechanisms. We address this question by identifying the individual contributions of mechanisms tuned to different ranges of spatial frequencies and contrast. We measure spatial-alignment and bisection error as a function of element separation at each of a number of spatial scales, using spectrally narrow-band stimuli of fixed supra-threshold contrast. We show that stimuli which minimize the extent of neural recruitment across different spatial channels before the site of extraction of the local contrast energy (and to 2 lesser extent across different contrast channels) do not exhibit Weber's law for either alignment or bisection. We present evidence that Weber's law for localization with increasing separation, found for stimuli of high contrast and broad-band spatial frequency content, is a consequence of the successive disengagement of unitary neural mechanisms, each of which has different spatial and contrast properties, and none of which individually exhibits Weber's law for spatial position.
引用
收藏
页码:1673 / 1684
页数:12
相关论文
共 43 条
[21]   THEORY OF SPATIAL POSITION AND SPATIAL-FREQUENCY RELATIONS IN THE RECEPTIVE-FIELDS OF SIMPLE CELLS IN THE VISUAL-CORTEX [J].
KULIKOWSKI, JJ ;
MARCELJA, S ;
BISHOP, PO .
BIOLOGICAL CYBERNETICS, 1982, 43 (03) :187-198
[22]  
LEVI DM, 1990, VISION RES, V30, P557, DOI 10.1016/0042-6989(90)90068-V
[23]   SPATIAL LOCALIZATION IN NORMAL AND AMBLYOPIC VISION [J].
LEVI, DM ;
KLEIN, SA .
VISION RESEARCH, 1983, 23 (10) :1005-1017
[24]   BOTH SEPARATION AND ECCENTRICITY CAN LIMIT PRECISE POSITION JUDGEMENTS - A REPLY TO MORGAN AND WATT [J].
LEVI, DM ;
KLEIN, SA .
VISION RESEARCH, 1989, 29 (10) :1463-1469
[25]  
Luce R. D., 1963, HDB MATH PSYCHOL, P1
[26]   THE WEBER RELATION FOR POSITION IS NOT AN ARTIFACT OF ECCENTRICITY [J].
MORGAN, MJ ;
WATT, RJ .
VISION RESEARCH, 1989, 29 (10) :1457-1462
[27]   OPPONENT MODEL FOR LINE INTERVAL DISCRIMINATION - INTERVAL AND VERNIER PERFORMANCE COMPARED [J].
MORGAN, MJ ;
REGAN, D .
VISION RESEARCH, 1987, 27 (01) :107-&
[28]   THE RELATIVE IMPORTANCE OF LOCAL PHASE AND LOCAL AMPLITUDE IN PATCHWISE IMAGE-RECONSTRUCTION [J].
MORGAN, MJ ;
ROSS, J ;
HAYES, A .
BIOLOGICAL CYBERNETICS, 1991, 65 (02) :113-119
[29]   FEATURE DETECTION IN HUMAN-VISION - A PHASE-DEPENDENT ENERGY-MODEL [J].
MORRONE, MC ;
BURR, DC .
PROCEEDINGS OF THE ROYAL SOCIETY SERIES B-BIOLOGICAL SCIENCES, 1988, 235 (1280) :221-+
[30]   A MODEL FOR THE ECONOMICAL ENCODING OF THE VISUAL IMAGE IN CEREBRAL-CORTEX [J].
SAKITT, B ;
BARLOW, HB .
BIOLOGICAL CYBERNETICS, 1982, 43 (02) :97-108