A normal digit span includes how many digits forward and backward?

A normal digit span includes how many digits forward and backward?

• A. Five digits forward and four digits backward
• B. Six digits forward and five digits backward
• C. Four digits forward and three digits backward
• D. Seven digits forward and six digits backward

Answer: (A)

Digit span taps short-term memory capacity and the ability to manipulate information. For most people, holding a sequence in the same order (forward) is about five items. Recalling the same sequence in reverse order adds the extra step of manipulation, so it’s typically about four items. This pattern—five forward, four backward—best matches normal performance, which is why that option is correct. Larger forward spans (six or seven) usually exceed what's typical for most individuals, and backward spans are shorter because reversing the order requires more cognitive effort.

Digit span taps short-term memory capacity and the ability to manipulate information. For most people, holding a sequence in the same order (forward) is about five items. Recalling the same sequence in reverse order adds the extra step of manipulation, so it’s typically about four items. This pattern—five forward, four backward—best matches normal performance, which is why that option is correct. Larger forward spans (six or seven) usually exceed what's typical for most individuals, and backward spans are shorter because reversing the order requires more cognitive effort.