Table 2. NUMBER DISCRIMINATION.
Auditory Discriminations, Sucking, Head Turn, Habituation Procedures
| Study | Age | Quantities Tested | Discriminated? | Continuous Variables Controlled? |
|---|---|---|---|---|
| Bijeljac-babic, Bertoncini, & Mehler (1993) | 4 days | 2 vs 3 | Yes | Yes‡ |
| Lipton & Spelke (2004) | 8-9 mos | 2 vs 3 | No | Yes‡ |
| Lipton & Spelke (2004) | 5-6 mos | 2 vs 4 | No | Yes‡ |
| Lipton & Spelke (2004) | 8-9 mos | 4 vs 5 | No | Yes‡ |
| Lipton & Spelke (2004) | 5-6 mos | 4 vs 6 | No | Yes‡ |
| Lipton & Spelke (2004) | 8-9 mos | 4 vs 6 | Yes | Yes‡ |
| Lipton & Spelke (2004) | 5-6 mos | 4 vs 8 | Yes | Yes‡ |
| Lipton & Spelke (2003) | 8-9 mos | 8 vs 10 | No | Yes‡ |
| Lipton & Spelke (2003) | 5-6 mos | 8 vs 12 | No | Yes‡ |
| Lipton & Spelke (2003) | 8-9 mos | 8 vs 12 | Yes | Yes‡ |
| Lipton & Spelke (2003) | 5-6 mos | 8 vs 16 | Yes | Yes‡ |
| vanMarle & Wynn (2009) | 5-7 mos | 2 vs 4 | Yes | Yes‡ |
| vanMarle & Wynn (2009) | 6-7 mos | 2 vs 3 | No | Yes‡ |
This table is a list of studies conducted to investigate infants’ auditory quantity discriminations. Many of these studies use a head turn procedure; the first study uses a sucking procedure; the last two studies use a habituation procedure. The structure of the table is similar to the Table 1. Column 4 indicates whether or not infants discriminated the quantities. Column 5 indicates whether or not continuous variables such as total sound duration and interstimulus intervals were controlled. Responses in this column accompanied by a ‡ indicate that these variables were varied during familiarization as a control.