Table 2.
Number of studies for each set in relation to design type, temporality, sample type and stimuli
| Study set | Design type | Temporality | Sample type | Stimuli+ | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| D | E | Cs | Cq | L | CS | Int | Ext | R | O | A | NO | D/I | P | V | L | S/M | |
| Preference and habituation | - | 156 | 141 | 15 | - | - | 153 | 3 | 18 | 18 | 6 | 5 | 86 | 15 | 17 | 11 | 12 |
| Category extension | 1 | 48 | 37 | 10 | 2 | - | 46 | 3 | 12 | 8 | 18 | 13 | 3 | - | 3 | 2 | - |
| Object sorting | - | 5 | 3 | 2 | - | 5 | - | 2 | 3 | - | 3 | - | - | - | 2 | - | |
| Sequential touching | - | 27 | 7 | 18 | 2 | - | 25 | 2 | 28 | 5 | 4 | 1 | 2 | 1 | - | - | - |
| Object examining | - | 34 | 22 | 11 | 1 | - | 32 | 2 | 21 | 2 | - | 13 | - | - | - | 4 | - |
| Other methods | 7 | 3 | 3 | 3 | 4 | 2 | 8 | - | 1 | 1 | 3 | - | 2 | - | - | - | - |
| Total | 8 | 273 | 213 | 59 | 9 | 2 | 269 | 10 | 82 | 37 | 31 | 35 | 93 | 16 | 20 | 19 | 12 |
Note. D= descriptive, E= experimental; Cs= cross-sectional, Cq= cross-sequential, L =longitudinal; Cs= case study; Int= intensive, Ext= extensive; R= replicas, O= objects; A= artefacts; NO= non-objects; D/I= drawings and images; P= patterns; V= videos; L= language; S/M= sounds and music. + As a single study can feature more than one type of stimuli, the sum of the number of studies for each column does not reflect the total number of studies we analysed