scholarly journals Correction for Bressloff and Cowan, A spherical model for orientation and spatial-frequency tuning in a cortical hypercolumn

2003 ◽  
Vol 358 (1440) ◽  
pp. 2063-2063
Author(s):  
P. C. Bressloff ◽  
J. D. Cowan
Keyword(s):  
Spatial Frequency ◽  
Frequency Tuning ◽  
Spherical Model ◽  
Related Article ◽  
Link Type ◽  
Spatial Frequency Tuning ◽  
Article Type

Correction for ‘A spherical model for orientation and spatial-frequency tuning in a cortical hypercolumn’ by P. C. Bressloff and J. D. Cowan (Phil. Trans. R. Soc. Lond. B 357 , 1643–1667. (doi: 10.1098/rstb.2002.1109 )). On page 1463, the published online date should read 8 November 2002.

Role of intrathalamic inhibition on the spatial frequency tuning of neurons in the lateral geniculate nucleus of the cat

2009 ◽  
Vol 65 ◽  
pp. S106
Author(s):  
Akihiro Kimura ◽  
Satoshi Shimegi ◽  
Shin-ichiro Hara ◽  
Masahiro Okamoto ◽  
Hiromichi Sato
Keyword(s):  
Spatial Frequency ◽  
Lateral Geniculate Nucleus ◽  
Frequency Tuning ◽  
Spatial Frequency Tuning ◽  
Lateral Geniculate

Adaptation in single units in visual cortex: The tuning of aftereffects in the spatial domain

1989 ◽  
Vol 2 (6) ◽  
pp. 593-607 ◽  
Author(s):  
A. B. Saul ◽  
M. S. Cynader
Keyword(s):  
Spatial Frequency ◽  
Cortical Neurons ◽  
Frequency Tuning ◽  
Cortical Cell ◽  
Selective Adaptation ◽  
Single Units ◽  
Spatial Frequency Tuning ◽  
Sinusoidal Gratings ◽  
A Cell ◽  
Drift Direction

AbstractCat striate cortical neurons were investigated using a new method of studying adaptation aftereffects. Stimuli were sinusoidal gratings of variable contrast, spatial frequency, and drift direction and rate. A series of alternating adapting and test trials was presented while recording from single units. Control trials were completely integrated with the adapted trials in these experiments.Every cortical cell tested showed selective adaptation aftereffects. Adapting at suprathreshold contrasts invariably reduced contrast sensitivity. Significant aftereffects could be observed even when adapting at low contrasts.The spatial-frequency tuning of aftereffects varied from cell to cell. Adapting at a given spatial frequency generally resulted in a broad response reduction at test frequencies above and below the adapting frequency. Many cells lost responses predominantly at frequencies lower than the adapting frequency.The tuning of aftereffects varied with the adapting frequency. In particular, the strongest aftereffects occurred near the adapting frequency. Adapting at frequencies just above the optimum for a cell often altered the spatial-frequency tuning by shifting the peak toward lower frequencies. The fact that the tuning of aftereffects did not simply match the tuning of the cell, but depended on the adapting stimulus, implies that extrinsic mechanisms are involved in adaptation effects.

Spatial-frequency and orientation tuning in psychophysical end-stopping

1998 ◽  
Vol 15 (4) ◽  
pp. 585-595 ◽  
Author(s):  
CONG YU ◽  
DENNIS M. LEVI
Keyword(s):  
Spatial Frequency ◽  
Frequency Tuning ◽  
Spatial Filter ◽  
Orientation Tuning ◽  
Maximal Strength ◽  
Facilitation Effect ◽  
Spatial Filters ◽  
Spatial Frequency Tuning ◽  
Spatial Frequencies ◽  
Wide Range

A psychophysical analog to cortical receptive-field end-stopping has been demonstrated previously in spatial filters tuned to a wide range of spatial frequencies (Yu & Levi, 1997a). The current study investigated tuning characteristics in psychophysical spatial filter end-stopping. When a D6 (the sixth derivative of a Gaussian) target is masked by a center mask (placed in the putative spatial filter center), two end-zone masks (placed in the filter end-zones) reduce thresholds. This “end-stopping” effect (the reduction of masking induced by end-zone masks) was measured at various spatial frequencies and orientations of end-zone masks. End-stopping reached its maximal strength when the spatial frequency and/or orientation of the end-zone masks matched the spatial frequency and/or orientation of the target and center mask, showing spatial-frequency tuning and orientation tuning. The bandwidths of spatial-frequency and orientation tuning functions decreased with increasing target spatial frequency. At larger orientation differences, however, end-zone masks induced a secondary facilitation effect, which was maximal when the spatial frequency of end-zone masks equated the target spatial frequency. This facilitation effect might be related to certain types of contour and texture perception, such as perceptual pop-out.

Receptive Field Size and Response Latency Are Correlated Within the Cat Visual Thalamus

2005 ◽  
Vol 93 (6) ◽  
pp. 3537-3547 ◽  
Author(s):  
Chong Weng ◽  
Chun-I Yeh ◽  
Carl R. Stoelzel ◽  
Jose-Manuel Alonso
Keyword(s):  
Receptive Field ◽  
Spatial Frequency ◽  
Response Latency ◽  
Time Course ◽  
Frequency Tuning ◽  
Receptive Fields ◽  
Cortical Cell ◽  
Field Size ◽  
Receptive Field Size ◽  
Spatial Frequency Tuning

Each point in visual space is encoded at the level of the thalamus by a group of neighboring cells with overlapping receptive fields. Here we show that the receptive fields of these cells differ in size and response latency but not at random. We have found that in the cat lateral geniculate nucleus (LGN) the receptive field size and response latency of neighboring neurons are significantly correlated: the larger the receptive field, the faster the response to visual stimuli. This correlation is widespread in LGN. It is found in groups of cells belonging to the same type (e.g., Y cells), and of different types (i.e., X and Y), within a specific layer or across different layers. These results indicate that the inputs from the multiple geniculate afferents that converge onto a cortical cell (approximately 30) are likely to arrive in a sequence determined by the receptive field size of the geniculate afferents. Recent studies have shown that the peak of the spatial frequency tuning of a cortical cell shifts toward higher frequencies as the response progresses in time. Our results are consistent with the idea that these shifts in spatial frequency tuning arise from differences in the response time course of the thalamic inputs.

scholarly journals Correction for Kiel and Goedert, Deep-sea food bonanzas: early Cenozoic whale-fall communities resemble wood-fall rather than seep communities

2006 ◽  
Vol 273 (1605) ◽  
pp. 3133-3133
Author(s):  
Steffen Kiel ◽  
James L. Goedert
Keyword(s):  
Deep Sea ◽  
Electronic Supplementary Material ◽  
Complete List ◽  
Related Article ◽  
Link Type ◽  
Article Type ◽  
Supplementary Material ◽  
Early Cenozoic ◽  
Wood Fall

Correction for ‘Deep-sea food bonanzas: early Cenozoic whale-fall communities resemble wood-fall rather than seep communities’ by Steffen Kiel and James L. Goedert (Proc. R. Soc. B 273 , 2625–2631. (doi: 10.1098/rspb.2006.3620 )). On page 2626, seven lines before the end of section 2, the complete list of sites and species is available online, but is not published as electronic supplementary material to this paper.

scholarly journals Dynamics of spatial frequency tuning of macaque LGN

2010 ◽  
Vol 2 (7) ◽  
pp. 219-219
Author(s):  
C. Bredfeldt ◽  
D. Ringach
Keyword(s):  
Spatial Frequency ◽  
Frequency Tuning ◽  
Spatial Frequency Tuning

scholarly journals The impact of face size and natural contour on spatial frequency tuning: still no difference between upright and inverted faces!

2015 ◽  
Vol 15 (12) ◽  
pp. 160
Author(s):  
Jessica Royer ◽  
Verena Willenbockel ◽  
Caroline Blais ◽  
Frédéric Gosselin ◽  
Sandra Lafortune ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Frequency Tuning ◽  
Spatial Frequency Tuning ◽  
The Impact ◽  
Face Size

scholarly journals Correction for Clifford Hiley Mortimer. 27 February 1911 — 11 May 2010

2012 ◽  
Vol 58 ◽  
pp. 347-347
Author(s):  
A. S. Brooks ◽  
J. W. G. Lund ◽  
J. F. Talling
Keyword(s):  
Research Laboratory ◽  
Mine Design ◽  
Related Article ◽  
Link Type ◽  
Article Type

Biogr. Mems Fell. R. Soc. 57 , 291–314 (2011; Published online 15 June 2011) ( http://dx.doi.org/10.1098/rsbm.2011.0006 ) We regret the following errors in the memoir: Mortimer’s unpublished notes (2006), cited on page 298, correctly state that the proper title for ‘Admiralty Mine Department’ was ‘Admiralty Mine Design Department’, or MDD. Of the scientists named in the top paragraph of page 299, only Deacon, Longuet-Higgins and Mortimer were in fact members of ‘Group W’ of the Admiralty Research Laboratory at Teddington; Crick and Penman remained for a time in the MDD at Havant, and Laughton joined the National Institute of Oceanography much later, in 1955. The last three words of the Laughton et al. (2010) reference on page 312 should be ‘Cambridge: Lutterworth Press’.

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