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In this paper we examine how people represent graphical information. We present a constrained graphical reasoning task isomorphic in logical structure to a three-term series reasoning problem. Participants were shown pairs of simple line graphs (premise graphs) and were then required to verify a third line graph (conclusion graph). We found that(More)
In this paper we argue that people construct analogical representations of the information that they extract from simple graphs and that these representations are subject to the same nomic constraints as the original graphical representations. We briefly review behavioural and neuropsychological findings across a range of tasks related to graph(More)
Ultraviolet (UV)-induced immunosuppression is a critical step in UV carcinogenesis, permitting tumour outgrowth. We investigated the effect of dietary beta-carotene on UV suppression of contact hypersensitivity (CHS) to trinitrochlorobenzene (TNCB) in BALB/c mice. Mice were fed for 10-16 weeks chow alone or supplemented with 1% beta-carotene or placebo as(More)
Solar ultraviolet-B radiation (UVB; 290-320 nm) causes skin cancer and suppresses cell-mediated immunity, preventing the rejection of UV-induced tumors. One mechanism initiating UV suppression involves the trans to cis photoisomerization of urocanic acid (UCA), a histidine derivative found in the stratum corneum. The addition of L-histidine to nonpurified(More)
People sometimes appear to represent graphical information by analogy to space. In this paper we consider the extent to which the tendency to represent information by analogy to space calls on spatial resources. We also examine whether people who represent graphical information spatially also represent numerical information using a spatial number line.(More)
Ultraviolet B radiation (280-320 nm) can systemically suppress contact hypersensitivity (CHS), delayed type hypersensitivity (DTH) and tumor rejection responses in mice. Several models have been postulated for the initiation of this UVB-induced immune suppression and, although the complete mechanism is unclear, our early studies suggested that initiation is(More)
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