Table 1.

Curvature discrimination and matching studies. Curvature is expressed in 1 m⁻¹.

study	curvature range	stimulus size	exploration	stimulus	figure
[8]a	−5.7–5.7	20 cm	dynamic	cylinders	1a
[21]b	−2–2	20 cm	dynamic	strips
[22]b	−1.6–1.6	20 cm	dynamic	strips
[23]b	−1.6–1.6	20 cm	dynamic	strips
[24]b	0–19	4 cm	dynamic	plano-convex lenses
[25]	−48.8–694	1 cm	passive	spherically curved
[26]	154–397	0.5 cm	passive	spherically curved
[27]a	−1.8–1.8	20 cm	static	strips	1c (right)
[14]a	−4–4	20 cm	static, dynamic	strips	1c (right)
[10]a	−4–4	20 cm	static	0th, 1st, 2nd order	1c
[10]a	−2.83–2.83	20 cm	static	cylinders	1a
[10]a	−2.83–2.83	20 cm	static	quadrics	1a
[15]	−4–4	20 cm	dynamic	0th, 1st, 2nd order
[19]a	20–46	7−7.3 cm	static, dynamic	cylinders	1e
[17]a		150 µm−24 cm	dynamic	Gaussian strips	1d
[13]a	1.18–4.05	29 cm	dynamic	cylinders	1b
[20]a	20–46	3 cm	dynamic	curved blocks	1g,h

^aStudies done in Utrecht.

^bCurvatures estimated from stimulus description.