This assumption receives support from the observation that across a variety of social modalities, infants in their first 6 months devote more attention to positive stimuli, with a bias toward negativity developing later (Vaish et al., 2008).
This assumption receives support from the presence of color-opponent horizontal cells [ 26, 27] and the concentrically-antagonistic center-surround organization in retinal bipolar [ 28, 29] and ganglion cells [ 30] in lower vertebrates.
This assumption receives support from the expression pattern of the Engrailed protein in the tardigrade embryo, which is localised in the posterior ectoderm of each segment, thus resembling the situation in arthropods [ 40].
The present paper shows that concepts from other cultures may challenge taken-for-granted assumptions, received wisdoms, and established conventions.
However, reliable inference about potential impacts can only be made if reliable methods are employed and if critical assumptions receive empirical evaluation.
With this assumption, the received sample, after the OFDM demodulation, corresponding to the k th subcarrier on the m th antenna, as presented in Figure 2, can be modeled by Equation 1: Figure 2 Receiving structure in the SIMO context.
Under the AWGN channel assumption, the received signal can be represented as begin{array}{*{20}l} left{ begin{array}{c} r_{x,n}=x_{n}+n_{x,n}, r_{y,n}=y_{n}+n_{y,n}, end{array} right.
In compliance with the wideband assumption, the received signal resulting from the l th path is given by h ̄ l α l s ̄ ( α l ( t − τ l ) ), where α l = c + v l c − v l ≈ 1 + 2 v l c is the scaling factor with c the speed of the communication medium (normally c ≫ v l ) and α l is added as a normalization factor.
This assumption has received less attention in the literature, likely because it is difficult to obtain information about movements of unobserved animals.
