H Ikeda's research while affiliated with University of London and other places

... n in baseball players implies that they perceived the ball-flight information through their peripheral field, which is consistent with Mann's results. As already stated, the dorsal visual pathway relies only on visual input from the magnocellular stream (e.g., Boussaoud, Desimone, & Ungerleider, 1991; Livingstone & Hubel, 1987; Shipp & Zeki, 1985). Wright and Ikeda (1974) reported that the magnocellular ganglion cells were more prevalent in the periphery of the retina (Schiller & Malpeli, 1978 ). These findings suggest that ball-flight information conveyed from the peripheral field may enhance dorsal visual processing in baseball players. Furthermore, CRs in both groups decreased when the color change oc ...

... In the following years, many other functional properties of V1 neurons have been discovered. Among them, spatial frequency selectivity (Enroth-Cugell and Robson, 1966); temporal frequency selectivity (Ikeda and Wright, 1975) and contrast selectivity (Ikeda and Wright, 1974;Movshon et al., 1978) emerged as remarkable hallmarks. Another notable, but not exclusive, functional feature of V1 resides in the organization of neurons sharing functional properties into functional columns (Hubel and Wiesel, 1969;Mountcastle, 1957). ...

... Based solely on the mean optimal spatial frequency, PLLS area could be considered, along with area 21b (Tardif et al., 2000), as a very low spatial frequency analyzer. In comparison, extrastriate areas 18, 19, 21a, and PMLS (Movshon et al., 1978;Tardif et al., 1996;Tardif et al., 1997;Khayat et al., 2000) could be considered mid-range spatial frequency analyzers, and area 17, of course, being the high spatial frequency analyzer (Ikeda and Wright, 1975;Tardif et al., 2000). Furthermore, based on the mean spatial bandwidth, area PLLS is more similar to areas 19, 21b, and PMLS, because they have broader spatial bandwidths, than areas 17, 18, and 21a (Tardif et al., 2000). ...

... The X/Y dichotomy often has been assumed to represent the same populations as the X-like/Y-like dichotomy. It has been shown, however, that at least some ganglion cells of cat and monkey retina can sum in a linear fashion while showing transient responses to standing contrast (Ikeda and Wright, 1975;de Monasterio et al., 1976). Moreover, the response time course is highly dependent on adaptation level ( Jakiela et al., 1976;de Monasterio, 1978a). ...

... Studies in cats consistently found that upon MD or squint during the critical period, the layers responding to the affected eye were thinner (Hickey et al., 1977;Wiesel and Hubel, 1963b) and that the neuronal responses in these layers were slower or weaker (Eysel et al., 1979;Ikeda and Wright, 1976;Sestokas and Lehmkuhle, 1986;Wiesel and Hubel, 1963b). Also in human amblyopes it was noted that dLGN responses to the amblyopic eye were weaker (Hess et al., 2009). ...

... Another example of nonlinear summation that we have not considered is the "shift effect" (also known as the "periphery effect"), whereby the firing rate of a neuron can be increased by stimulus moving well outside the receptive field (McIlwain and Creutzfeldt, 1964;Levick et al., 1965;Ikeda and Wright, 1972;Kruger and Fischer, 1973;Derrington et al., 1979;Passaglia et al., 2001). Our model cannot explain this increase. ...

... Some studies argue for a selective P-cell deficit [Altmann and Singer, 1986], others for a selective M-cell deficit [Previc, 1989] and others for combined M-and P-deficits [Buckingham et al., 1991]. A similar divergence of opinion is seen in the neurophysiological literature with selective P- [Ikeda and Wright, 1974;Kubova et al., 1996] and M-cell losses [Sherman et al., 1975;Yin et al., 1997] claimed. In amblyopia, there are deficits for the detection of static-contrast stimuli as well as for the global processing of both motion [Aaen-Stockdale and Simmers et al., 2003Simmers et al., , 2006, spatial position [Gingras et al., 2005a,b;Hess and Holliday, 1992], and form Simmers et al., 2005]. ...

... We estimated the quality of the image formed at the retinal level by the refractive system of the opossum's eye, evaluating the Line Spread Function of its dioptric system. We used a " single-pass " method introduced by Hisako Ikeda and colleagues (Ikeda & Wright, 1973) to study the optical quality of the retinal image of the eye of the cat. One adult specimen of Didelphis marsupialis aurita (WIED, 1826) that weighed 1300 g was used. ...

... The post-stimulus spike patterns were extracted from concatenated 200 ms segments of data. The cortical unit response to flash in visual cortex of the rat is composed of two main components: an early or middle-latency (0-150 ms), and a late, sustained or long-latency (>200 ms) response 8,18,41,42 . Desflurane anesthesia selectively attenuates the long-latency response 18 , which presumably reflects a failure of the top-down feedback arm of sensory processing 39,[43][44][45] . ...

... Thus, all cells were studied under monocular viewing conditions. Quantitative measurements of the receptive field properties of each cell encountered were made using a grating stimulator (Dench, Ikeda & Wright, 1974) and the number of cells encountered at each layer of the LGN and their precise receptive field positions were analysed. Any intorsion of the eyes during paralysis, or a small torsional rotation (usually between 2 and 30 of downward rotation) due to the pull on the scleral suture, was assessed and corrected for the receptive field position. ...