Retinotopic organization within the cat's posterior suprasylvian sulcus and gyrus

Abstract

The organization of extrastriate visual areas of the cat's posterior suprasylvian sulcus and gyrus was studied with electrophysiological mapping methods. Analysis of retinotopic organization confirmed the presence of dorsal lateral and ventral lateral suprasylvian (DLS, VLS) visual areas (Palmer et al., '78, J. Comp. Neurol. 177:237-256) and demonstrated new features of organization. Areas DLS and VLS occupy the upper two-thirds of the posterior suprasylvian sulcus, with DLS wholly confined to the upper bank and VLS straddling the sulcal fundus. Both areas contain a partial representation of the lower quadrant of the visual field. A narrow strip of visually responsive cortex (periauditory belt) was identified adjoining DLS on the posterior ectosylvian gyrus; its organization and extent were not explored in detail. The organization of the posterior suprasylvian areas (PS) (Updyke, '82, Soc. Neurosci. Abst. 8:810) was explored in detail. Area PS lies inferior to areas VLS and 21b in the lower third of the posterior suprasylvian sulcus and gyrus, extending onto the fusiform gyrus. PS contains a partial representation of the lower quadrant of the visual field. It shares a representation of horizontal meridian with area 21b and a representation of central gaze with area VLS. Analysis of the PS/20 border region indicates that the representation of the lower quadrant periphery is common to the borders of PS, 20a, and 20b rather than lying internal to areas 20a and 20b as suggested by Tusa and Palmer ('80, J. Comp. Neurol. 193:147-164).

Distribution, morphology, and synaptic targets of corticothalamic terminals in the cat lateral posterior-pulvinar complex that originate from the posteromedial lateral suprasylvian cortex

“…Alternatively, the visual activity in the LPl that remains when area 17 is silenced may be contributed by projections from areas 18, 19, or 21a. These areas all innervate the LPl (Updyke, 1977(Updyke, , 1986Berson and Graybiel, 1983), and the projections from areas 18 and 19 have been shown to exhibit type II morphology (Ojima et al, 1996;Guillery et al, 2001). In addition, the LPl receives direct input from the retina (Boire et al, 2004).…”

Analysis of connectivity in the cat cerebral cortex

“…AMLS, anteromedial lateral suprasylvian area (Palmer et al, 1978;Symonds and Rosenquist, 1984a;Rosenquist, 1985) a visual area in the medial wall of the suprasylvian sulcus. VLS, ventrolateral suprasylvian area (Palmer et al, 1978;Symonds and Rosenquist, 1984a;Rosenquist, 1985;Updyke, 1986), a visual area situated in the posterior wall of the posterior part of the suprasylvian sulcus. PMLS, VLS, and parts of PLLS and AMLS correspond to the Clare-Bishop area of other parcellation schemes (Clare and Bishop, 1954;Sherk, 1986;Grant and Shipp, 1991;Sherk and Mulliganm 1993).…”

“…ALLS, anterolateral lateral suprasylvian area (Palmer et al, 1978;Symonds and Rosenquist, 1984a;Rosenquist, 1985), a visual area in the lateral wall of the anterior part of the middle suprasylvian sulcus. DLS, dorsolateral suprasylvian area, a visual area in the anterior wall of the posterior part of the suprasylvian gyrus (Palmer et al, 1978;Symonds and Rosenquist, 1984a;Rosenquist, 1985;Updyke, 1986). PLLS, ALLS, and DLS overlap with the lateral suprasylvian area in other parcellation schemes (Sherk, 1986;.…”

“…20a, area 20a, a retinotopically organized visual area on the posterior ectosylvian gyrus (Tusa and Palmer, 1980;Symonds and Rosenquist, 1984a;Kuchiiwa et al, 1985;Rosenquist, 1985). 20b, area 20b, a retinotopically organized visual area on the posterior ectosylvian gyrus (Tusa and Palmer, 1980;Symonds and Rosenquist, 1984a;Kuchiiwa et al, 1985;Rosenquist, 1985;Updyke, 1986).…”

Dissociable influences of primary auditory cortex and the posterior auditory field on neuronal responses in the dorsal zone of auditory cortex

“…However, A2 neurons exhibit sustained responses with peak response latencies comparable to or longer than those of DZ (Schreiner and Cynader 1984;Carrasco and Lomber 2010), making it unlikely that information processed in A2 would shape DZ responses, at least during the early phases of the response. While DZ receives projections from other auditory cortical areas, most of these areas either receive strong projections from A1 and/or PAF (Lee and Winer 2008b) or are higher order/parabelt areas known to respond to visual as well as auditory stimulation (Reale and Imig 1980;Updyke 1986), making it more likely that these serve as feedback projections. Any of the sources of input discussed may modulate aspects of DZ responses following deactivation via cortico-cortical connections and/or cortico-thalamo-cortical loops (Winer et al 2001;Lee and Winer 2008a); however, dorsal MGN, AAF, and fAES are likely the primary sources of "bottom-up" auditory input to DZ that could account for the perseveration of responses following reversible deactivation of A1 and/or PAF.…”