scholarly journals Local grouping in glass patterns: Chromatic and luminance tuning

2010 ◽  
Vol 6 (6) ◽  
pp. 759-759
Author(s):  
C.-C. Chen
Keyword(s):  
Glass Patterns ◽  
Local Grouping

Parsing of Melody: Quantification and Testing of the Local Grouping Rules of Lerdahl and Jackendoff's A Generative Theory of Tonal Music

2004 ◽  
Vol 21 (4) ◽  
pp. 499-543 ◽  
Author(s):  
Bradley W. Frankland ◽  
Annabel J. Cohen
Keyword(s):  
Multiple Regression ◽  
Musical Training ◽  
Length Change ◽  
Tonal Music ◽  
Nursery Rhyme ◽  
Generative Theory ◽  
Wide Range ◽  
Identical Manner ◽  
Repeated Experiment ◽  
Local Grouping

In two experiments, the empirical parsing of melodies was compared with predictions derived from four grouping preference rules of A Generative Theory of Tonal Music (F. Lerdahl & R. Jackendoff, 1983). In Experiment 1 (n = 123), listeners representing a wide range of musical training heard two familiar nursery-rhyme melodies and one unfamiliar tonal melody, each presented three times. During each repetition, listeners indicated the location of boundaries between units by pressing a key. Experiment 2 (n = 33) repeated Experiment 1 with different stimuli: one familiar and one unfamiliar nursery-rhyme melody, and one unfamiliar, tonal melody from the classical repertoire. In all melodies of both experiments, there was good within-subject consistency of boundary placement across the three repetitions (mean r = .54). Consistencies between Repetitions 2 and 3 were even higher (mean r = .63). Hence, Repetitions 2 and 3 were collapsed. After collapsing, there was high between-subjects similarity in boundary placement for each melody (mean r = .62), implying that all participants parsed the melodies in essentially the same (though not identical) manner. A role for musical training in parsing appeared only for the unfamiliar, classical melody of Experiment 2. The empirical parsing profiles were compared with the quantified predictions of Grouping Preference Rules 2a (the Rest aspect of Slur/Rest), 2b (Attack-point), 3a (Register change), and 3d (Length change). Based on correlational analyses, only Attack-point (mean r = .80) and Rest (mean r = .54) were necessary to explain the parsings of participants. Little role was seen for Register change (mean r = .14) or Length change (mean r = ––.09). Solutions based on multiple regression further reduced the role for Register and Length change. Generally, results provided some support for aspects of A Generative Theory of Tonal Music, while implying that some alterations might be useful.

Temporal characteristics of global form perception in translational and circular Glass patterns

2021 ◽  
Vol 187 ◽  
pp. 102-109
Author(s):  
Rita Donato ◽  
Andrea Pavan ◽  
Jorge Almeida ◽  
Massimo Nucci ◽  
Gianluca Campana
Keyword(s):  
Form Perception ◽  
Temporal Characteristics ◽  
Global Form ◽  
Glass Patterns

scholarly journals Glass Patterns: Some Contrast Effects Re-Evaluated

Perception ◽  
1997 ◽  
Vol 26 (3) ◽  
pp. 253-268 ◽  
Author(s):  
Steven C Dakin
Keyword(s):  
Spatial Filtering ◽  
Contrast Effects ◽  
Visual Grouping ◽  
Relative Contrast ◽  
Low Pass ◽  
Band Pass ◽  
Opposite Contrast ◽  
Low Pass Filters ◽  
Glass Patterns ◽  
High Pass

The relative contrast of features is known to be important in determining if they can be grouped. Two manipulations of feature contrast have previously been used to criticise models of visual grouping based on spatial filtering: high-pass filtering and reversal of contrast polarity. The effects of these manipulations are considered in the context of the perception of Glass patterns. It is shown that high-pass filtering elements, whilst destroying structure in the output of low-pass filters, do not significantly disrupt the output of locally band-pass filters. The finding that subjects can perceive structure in Glass patterns composed of high-pass features therefore offers no evidence against such spatial filtering mechanisms. Band-pass filtering models are shown to explain the rotation of perceived structure in Glass patterns composed of opposite contrast features. However, structure is correctly perceived in patterns composed of two ‘interleaved’ opposite contrast patterns, which is problematic for oriented filtering mechanisms. Two possible explanations are considered: nonlinear contrast transduction prior to filtering, and integration of local orientation estimates from first-order and second-order mechanisms.

scholarly journals Perception of dynamic Glass patterns

2012 ◽  
Vol 72 ◽  
pp. 55-62 ◽  
Author(s):  
Jean-François Nankoo ◽  
Christopher R. Madan ◽  
Marcia L. Spetch ◽  
Douglas R. Wylie
Keyword(s):  
Glass Patterns

scholarly journals Temporal summation of global form signals in dynamic Glass patterns

2015 ◽  
Vol 107 ◽  
pp. 30-35 ◽  
Author(s):  
Jean-François Nankoo ◽  
Christopher R. Madan ◽  
Marcia L. Spetch ◽  
Douglas R. Wylie
Keyword(s):  
Temporal Summation ◽  
Global Form ◽  
Glass Patterns

A Dorsal Visual Route Necessary for Global Form Perception: Evidence from Neuropsychological fMRI

2014 ◽  
Vol 26 (3) ◽  
pp. 621-634 ◽  
Author(s):  
Vaia Lestou ◽  
Judith Mi Lin Lam ◽  
Katie Humphreys ◽  
Zoe Kourtzi ◽  
Glyn W. Humphreys
Keyword(s):  
Visual Processing ◽  
Form Perception ◽  
Dorsal Cortex ◽  
Global Pattern ◽  
Local Integration ◽  
Global Patterns ◽  
Cortical Regions ◽  
High Level ◽  
Glass Patterns ◽  
Pattern Coding

Hierarchical models of visual processing assume that global pattern recognition is contingent on the progressive integration of local elements across larger spatial regions, operating from early through intermediate to higher-level cortical regions. Here, we present results from neuropsychological fMRI that refute such models. We report two patients, one with lesions to intermediate ventral regions and the other with damage around the intraparietal sulcus (IPS). The patient with ventral damage showed normal behavioral and BOLD responses to global Glass patterns. The patient with IPS damage was impaired in discriminating global patterns and showed a lack of significant responses to these patterns in intermediate visual regions spared by the lesion. However, this patient did show BOLD activity to translational patterns, where local element relations are important. These results suggest that activation of intermediate ventral regions is not necessary to code global patterns; instead global patterns are coded in a heterarchical fashion. High-level regions of dorsal cortex are necessary to generate global pattern coding in intermediate ventral regions; in contrast, local integration processes are not sufficient.

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