Table 1.

Exponential fit parameters for mean data, expressed as the best fit value and its 95% confidence interval (95% CI).

	Y0	Plateau	Tau	Span
Color	76.5 ± 3.45	53.6 ± 4.53	808.6 ± 600.0	22.87 ± 5.87
Orientation	81.6 ± 2.73	51.8 ± 3.42	715.8 ± 236.2	29.82 ± 4.57
Motion	67.3 ± 2.96	51.1 ± 2.58	327.5 ± 115.9	16.19 ± 2.93

A one-phase decay equation of the form Y = (Y0 − Plateau) × exp(−t/Tau) + Plateau was fitted to the data; where Y is performance (% correct responses), Y0 is performance at memory onset; Plateau is the performance reached for long delays, t is time after stimulus offset (ms) and Tau is the time constant (ms). The span corresponds to (Y0 – Plateau).